1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Expander
; use Expander
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
36 with Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Rident
; use Rident
;
44 with Restrict
; use Restrict
;
45 with Rtsfind
; use Rtsfind
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch7
; use Sem_Ch7
;
51 with Sem_Ch8
; use Sem_Ch8
;
52 with Sem_Ch10
; use Sem_Ch10
;
53 with Sem_Ch13
; use Sem_Ch13
;
54 with Sem_Disp
; use Sem_Disp
;
55 with Sem_Elab
; use Sem_Elab
;
56 with Sem_Elim
; use Sem_Elim
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Res
; use Sem_Res
;
59 with Sem_Type
; use Sem_Type
;
60 with Sem_Util
; use Sem_Util
;
61 with Sem_Warn
; use Sem_Warn
;
62 with Stand
; use Stand
;
63 with Sinfo
; use Sinfo
;
64 with Sinfo
.CN
; use Sinfo
.CN
;
65 with Sinput
; use Sinput
;
66 with Sinput
.L
; use Sinput
.L
;
67 with Snames
; use Snames
;
68 with Stringt
; use Stringt
;
69 with Uname
; use Uname
;
71 with Tbuild
; use Tbuild
;
72 with Uintp
; use Uintp
;
73 with Urealp
; use Urealp
;
77 package body Sem_Ch12
is
79 ----------------------------------------------------------
80 -- Implementation of Generic Analysis and Instantiation --
81 -----------------------------------------------------------
83 -- GNAT implements generics by macro expansion. No attempt is made to
84 -- share generic instantiations (for now). Analysis of a generic definition
85 -- does not perform any expansion action, but the expander must be called
86 -- on the tree for each instantiation, because the expansion may of course
87 -- depend on the generic actuals. All of this is best achieved as follows:
89 -- a) Semantic analysis of a generic unit is performed on a copy of the
90 -- tree for the generic unit. All tree modifications that follow analysis
91 -- do not affect the original tree. Links are kept between the original
92 -- tree and the copy, in order to recognize non-local references within
93 -- the generic, and propagate them to each instance (recall that name
94 -- resolution is done on the generic declaration: generics are not really
95 -- macros!). This is summarized in the following diagram:
97 -- .-----------. .----------.
98 -- | semantic |<--------------| generic |
100 -- | |==============>| |
101 -- |___________| global |__________|
112 -- b) Each instantiation copies the original tree, and inserts into it a
113 -- series of declarations that describe the mapping between generic formals
114 -- and actuals. For example, a generic In OUT parameter is an object
115 -- renaming of the corresponing actual, etc. Generic IN parameters are
116 -- constant declarations.
118 -- c) In order to give the right visibility for these renamings, we use
119 -- a different scheme for package and subprogram instantiations. For
120 -- packages, the list of renamings is inserted into the package
121 -- specification, before the visible declarations of the package. The
122 -- renamings are analyzed before any of the text of the instance, and are
123 -- thus visible at the right place. Furthermore, outside of the instance,
124 -- the generic parameters are visible and denote their corresponding
127 -- For subprograms, we create a container package to hold the renamings
128 -- and the subprogram instance itself. Analysis of the package makes the
129 -- renaming declarations visible to the subprogram. After analyzing the
130 -- package, the defining entity for the subprogram is touched-up so that
131 -- it appears declared in the current scope, and not inside the container
134 -- If the instantiation is a compilation unit, the container package is
135 -- given the same name as the subprogram instance. This ensures that
136 -- the elaboration procedure called by the binder, using the compilation
137 -- unit name, calls in fact the elaboration procedure for the package.
139 -- Not surprisingly, private types complicate this approach. By saving in
140 -- the original generic object the non-local references, we guarantee that
141 -- the proper entities are referenced at the point of instantiation.
142 -- However, for private types, this by itself does not insure that the
143 -- proper VIEW of the entity is used (the full type may be visible at the
144 -- point of generic definition, but not at instantiation, or vice-versa).
145 -- In order to reference the proper view, we special-case any reference
146 -- to private types in the generic object, by saving both views, one in
147 -- the generic and one in the semantic copy. At time of instantiation, we
148 -- check whether the two views are consistent, and exchange declarations if
149 -- necessary, in order to restore the correct visibility. Similarly, if
150 -- the instance view is private when the generic view was not, we perform
151 -- the exchange. After completing the instantiation, we restore the
152 -- current visibility. The flag Has_Private_View marks identifiers in the
153 -- the generic unit that require checking.
155 -- Visibility within nested generic units requires special handling.
156 -- Consider the following scheme:
158 -- type Global is ... -- outside of generic unit.
162 -- type Semi_Global is ... -- global to inner.
165 -- procedure inner (X1 : Global; X2 : Semi_Global);
167 -- procedure in2 is new inner (...); -- 4
170 -- package New_Outer is new Outer (...); -- 2
171 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
173 -- The semantic analysis of Outer captures all occurrences of Global.
174 -- The semantic analysis of Inner (at 1) captures both occurrences of
175 -- Global and Semi_Global.
177 -- At point 2 (instantiation of Outer), we also produce a generic copy
178 -- of Inner, even though Inner is, at that point, not being instantiated.
179 -- (This is just part of the semantic analysis of New_Outer).
181 -- Critically, references to Global within Inner must be preserved, while
182 -- references to Semi_Global should not preserved, because they must now
183 -- resolve to an entity within New_Outer. To distinguish between these, we
184 -- use a global variable, Current_Instantiated_Parent, which is set when
185 -- performing a generic copy during instantiation (at 2). This variable is
186 -- used when performing a generic copy that is not an instantiation, but
187 -- that is nested within one, as the occurrence of 1 within 2. The analysis
188 -- of a nested generic only preserves references that are global to the
189 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
190 -- determine whether a reference is external to the given parent.
192 -- The instantiation at point 3 requires no special treatment. The method
193 -- works as well for further nestings of generic units, but of course the
194 -- variable Current_Instantiated_Parent must be stacked because nested
195 -- instantiations can occur, e.g. the occurrence of 4 within 2.
197 -- The instantiation of package and subprogram bodies is handled in a
198 -- similar manner, except that it is delayed until after semantic
199 -- analysis is complete. In this fashion complex cross-dependencies
200 -- between several package declarations and bodies containing generics
201 -- can be compiled which otherwise would diagnose spurious circularities.
203 -- For example, it is possible to compile two packages A and B that
204 -- have the following structure:
206 -- package A is package B is
207 -- generic ... generic ...
208 -- package G_A is package G_B is
211 -- package body A is package body B is
212 -- package N_B is new G_B (..) package N_A is new G_A (..)
214 -- The table Pending_Instantiations in package Inline is used to keep
215 -- track of body instantiations that are delayed in this manner. Inline
216 -- handles the actual calls to do the body instantiations. This activity
217 -- is part of Inline, since the processing occurs at the same point, and
218 -- for essentially the same reason, as the handling of inlined routines.
220 ----------------------------------------------
221 -- Detection of Instantiation Circularities --
222 ----------------------------------------------
224 -- If we have a chain of instantiations that is circular, this is a
225 -- static error which must be detected at compile time. The detection
226 -- of these circularities is carried out at the point that we insert
227 -- a generic instance spec or body. If there is a circularity, then
228 -- the analysis of the offending spec or body will eventually result
229 -- in trying to load the same unit again, and we detect this problem
230 -- as we analyze the package instantiation for the second time.
232 -- At least in some cases after we have detected the circularity, we
233 -- get into trouble if we try to keep going. The following flag is
234 -- set if a circularity is detected, and used to abandon compilation
235 -- after the messages have been posted.
237 Circularity_Detected
: Boolean := False;
238 -- This should really be reset on encountering a new main unit, but in
239 -- practice we are not using multiple main units so it is not critical.
241 -----------------------
242 -- Local subprograms --
243 -----------------------
245 procedure Abandon_Instantiation
(N
: Node_Id
);
246 pragma No_Return
(Abandon_Instantiation
);
247 -- Posts an error message "instantiation abandoned" at the indicated
248 -- node and then raises the exception Instantiation_Error to do it.
250 procedure Analyze_Formal_Array_Type
251 (T
: in out Entity_Id
;
253 -- A formal array type is treated like an array type declaration, and
254 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
255 -- in-out, because in the case of an anonymous type the entity is
256 -- actually created in the procedure.
258 -- The following procedures treat other kinds of formal parameters.
260 procedure Analyze_Formal_Derived_Type
265 -- The following subprograms create abbreviated declarations for formal
266 -- scalar types. We introduce an anonymous base of the proper class for
267 -- each of them, and define the formals as constrained first subtypes of
268 -- their bases. The bounds are expressions that are non-static in the
271 procedure Analyze_Formal_Decimal_Fixed_Point_Type
272 (T
: Entity_Id
; Def
: Node_Id
);
273 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
274 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
275 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
276 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
277 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
278 (T
: Entity_Id
; Def
: Node_Id
);
280 procedure Analyze_Formal_Private_Type
284 -- This needs comments???
286 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
288 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
289 -- This needs comments ???
291 function Analyze_Associations
294 F_Copy
: List_Id
) return List_Id
;
295 -- At instantiation time, build the list of associations between formals
296 -- and actuals. Each association becomes a renaming declaration for the
297 -- formal entity. F_Copy is the analyzed list of formals in the generic
298 -- copy. It is used to apply legality checks to the actuals. I_Node is the
299 -- instantiation node itself.
301 procedure Analyze_Subprogram_Instantiation
305 procedure Build_Instance_Compilation_Unit_Nodes
309 -- This procedure is used in the case where the generic instance of a
310 -- subprogram body or package body is a library unit. In this case, the
311 -- original library unit node for the generic instantiation must be
312 -- replaced by the resulting generic body, and a link made to a new
313 -- compilation unit node for the generic declaration. The argument N is
314 -- the original generic instantiation. Act_Body and Act_Decl are the body
315 -- and declaration of the instance (either package body and declaration
316 -- nodes or subprogram body and declaration nodes depending on the case).
317 -- On return, the node N has been rewritten with the actual body.
319 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
320 -- Apply the following to all formal packages in generic associations.
322 procedure Check_Formal_Package_Instance
323 (Formal_Pack
: Entity_Id
;
324 Actual_Pack
: Entity_Id
);
325 -- Verify that the actuals of the actual instance match the actuals of
326 -- the template for a formal package that is not declared with a box.
328 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
329 -- If the generic is a local entity and the corresponding body has not
330 -- been seen yet, flag enclosing packages to indicate that it will be
331 -- elaborated after the generic body. Subprograms declared in the same
332 -- package cannot be inlined by the front-end because front-end inlining
333 -- requires a strict linear order of elaboration.
335 procedure Check_Hidden_Child_Unit
337 Gen_Unit
: Entity_Id
;
338 Act_Decl_Id
: Entity_Id
);
339 -- If the generic unit is an implicit child instance within a parent
340 -- instance, we need to make an explicit test that it is not hidden by
341 -- a child instance of the same name and parent.
343 procedure Check_Private_View
(N
: Node_Id
);
344 -- Check whether the type of a generic entity has a different view between
345 -- the point of generic analysis and the point of instantiation. If the
346 -- view has changed, then at the point of instantiation we restore the
347 -- correct view to perform semantic analysis of the instance, and reset
348 -- the current view after instantiation. The processing is driven by the
349 -- current private status of the type of the node, and Has_Private_View,
350 -- a flag that is set at the point of generic compilation. If view and
351 -- flag are inconsistent then the type is updated appropriately.
353 procedure Check_Generic_Actuals
354 (Instance
: Entity_Id
;
355 Is_Formal_Box
: Boolean);
356 -- Similar to previous one. Check the actuals in the instantiation,
357 -- whose views can change between the point of instantiation and the point
358 -- of instantiation of the body. In addition, mark the generic renamings
359 -- as generic actuals, so that they are not compatible with other actuals.
360 -- Recurse on an actual that is a formal package whose declaration has
363 function Contains_Instance_Of
366 N
: Node_Id
) return Boolean;
367 -- Inner is instantiated within the generic Outer. Check whether Inner
368 -- directly or indirectly contains an instance of Outer or of one of its
369 -- parents, in the case of a subunit. Each generic unit holds a list of
370 -- the entities instantiated within (at any depth). This procedure
371 -- determines whether the set of such lists contains a cycle, i.e. an
372 -- illegal circular instantiation.
374 function Denotes_Formal_Package
376 On_Exit
: Boolean := False) return Boolean;
377 -- Returns True if E is a formal package of an enclosing generic, or
378 -- the actual for such a formal in an enclosing instantiation. If such
379 -- a package is used as a formal in an nested generic, or as an actual
380 -- in a nested instantiation, the visibility of ITS formals should not
381 -- be modified. When called from within Restore_Private_Views, the flag
382 -- On_Exit is true, to indicate that the search for a possible enclosing
383 -- instance should ignore the current one.
385 function Find_Actual_Type
387 Gen_Scope
: Entity_Id
) return Entity_Id
;
388 -- When validating the actual types of a child instance, check whether
389 -- the formal is a formal type of the parent unit, and retrieve the current
390 -- actual for it. Typ is the entity in the analyzed formal type declaration
391 -- (component or index type of an array type) and Gen_Scope is the scope of
392 -- the analyzed formal array type.
394 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
;
395 -- Given the entity of a unit that is an instantiation, retrieve the
396 -- original instance node. This is used when loading the instantiations
397 -- of the ancestors of a child generic that is being instantiated.
399 function In_Same_Declarative_Part
401 Inst
: Node_Id
) return Boolean;
402 -- True if the instantiation Inst and the given freeze_node F_Node appear
403 -- within the same declarative part, ignoring subunits, but with no inter-
404 -- vening suprograms or concurrent units. If true, the freeze node
405 -- of the instance can be placed after the freeze node of the parent,
406 -- which it itself an instance.
408 function In_Main_Context
(E
: Entity_Id
) return Boolean;
409 -- Check whether an instantiation is in the context of the main unit.
410 -- Used to determine whether its body should be elaborated to allow
411 -- front-end inlining.
413 procedure Set_Instance_Env
414 (Gen_Unit
: Entity_Id
;
415 Act_Unit
: Entity_Id
);
416 -- Save current instance on saved environment, to be used to determine
417 -- the global status of entities in nested instances. Part of Save_Env.
418 -- called after verifying that the generic unit is legal for the instance.
420 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
421 -- Associate analyzed generic parameter with corresponding
422 -- instance. Used for semantic checks at instantiation time.
424 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
425 -- Traverse the Exchanged_Views list to see if a type was private
426 -- and has already been flipped during this phase of instantiation.
428 procedure Hide_Current_Scope
;
429 -- When compiling a generic child unit, the parent context must be
430 -- present, but the instance and all entities that may be generated
431 -- must be inserted in the current scope. We leave the current scope
432 -- on the stack, but make its entities invisible to avoid visibility
433 -- problems. This is reversed at the end of instantiations. This is
434 -- not done for the instantiation of the bodies, which only require the
435 -- instances of the generic parents to be in scope.
437 procedure Install_Body
442 -- If the instantiation happens textually before the body of the generic,
443 -- the instantiation of the body must be analyzed after the generic body,
444 -- and not at the point of instantiation. Such early instantiations can
445 -- happen if the generic and the instance appear in a package declaration
446 -- because the generic body can only appear in the corresponding package
447 -- body. Early instantiations can also appear if generic, instance and
448 -- body are all in the declarative part of a subprogram or entry. Entities
449 -- of packages that are early instantiations are delayed, and their freeze
450 -- node appears after the generic body.
452 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
453 -- Insert freeze node at the end of the declarative part that includes the
454 -- instance node N. If N is in the visible part of an enclosing package
455 -- declaration, the freeze node has to be inserted at the end of the
456 -- private declarations, if any.
458 procedure Freeze_Subprogram_Body
459 (Inst_Node
: Node_Id
;
461 Pack_Id
: Entity_Id
);
462 -- The generic body may appear textually after the instance, including
463 -- in the proper body of a stub, or within a different package instance.
464 -- Given that the instance can only be elaborated after the generic, we
465 -- place freeze_nodes for the instance and/or for packages that may enclose
466 -- the instance and the generic, so that the back-end can establish the
467 -- proper order of elaboration.
470 -- Establish environment for subsequent instantiation. Separated from
471 -- Save_Env because data-structures for visibility handling must be
472 -- initialized before call to Check_Generic_Child_Unit.
474 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
475 -- When compiling an instance of a child unit the parent (which is
476 -- itself an instance) is an enclosing scope that must be made
477 -- immediately visible. This procedure is also used to install the non-
478 -- generic parent of a generic child unit when compiling its body, so that
479 -- full views of types in the parent are made visible.
481 procedure Remove_Parent
(In_Body
: Boolean := False);
482 -- Reverse effect after instantiation of child is complete.
484 procedure Inline_Instance_Body
486 Gen_Unit
: Entity_Id
;
488 -- If front-end inlining is requested, instantiate the package body,
489 -- and preserve the visibility of its compilation unit, to insure
490 -- that successive instantiations succeed.
492 -- The functions Instantiate_XXX perform various legality checks and build
493 -- the declarations for instantiated generic parameters.
494 -- Need to describe what the parameters are ???
496 function Instantiate_Object
499 Analyzed_Formal
: Node_Id
) return List_Id
;
501 function Instantiate_Type
504 Analyzed_Formal
: Node_Id
;
505 Actual_Decls
: List_Id
) return Node_Id
;
507 function Instantiate_Formal_Subprogram
510 Analyzed_Formal
: Node_Id
) return Node_Id
;
512 function Instantiate_Formal_Package
515 Analyzed_Formal
: Node_Id
) return List_Id
;
516 -- If the formal package is declared with a box, special visibility rules
517 -- apply to its formals: they are in the visible part of the package. This
518 -- is true in the declarative region of the formal package, that is to say
519 -- in the enclosing generic or instantiation. For an instantiation, the
520 -- parameters of the formal package are made visible in an explicit step.
521 -- Furthermore, if the actual is a visible use_clause, these formals must
522 -- be made potentially use_visible as well. On exit from the enclosing
523 -- instantiation, the reverse must be done.
525 -- For a formal package declared without a box, there are conformance rules
526 -- that apply to the actuals in the generic declaration and the actuals of
527 -- the actual package in the enclosing instantiation. The simplest way to
528 -- apply these rules is to repeat the instantiation of the formal package
529 -- in the context of the enclosing instance, and compare the generic
530 -- associations of this instantiation with those of the actual package.
532 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
533 -- Test if given node is in the main unit
535 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
);
536 -- If the generic appears in a separate non-generic library unit,
537 -- load the corresponding body to retrieve the body of the generic.
538 -- N is the node for the generic instantiation, Spec is the generic
539 -- package declaration.
541 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
542 -- Add the context clause of the unit containing a generic unit to
543 -- an instantiation that is a compilation unit.
545 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
546 -- In order to propagate semantic information back from the analyzed
547 -- copy to the original generic, we maintain links between selected nodes
548 -- in the generic and their corresponding copies. At the end of generic
549 -- analysis, the routine Save_Global_References traverses the generic
550 -- tree, examines the semantic information, and preserves the links to
551 -- those nodes that contain global information. At instantiation, the
552 -- information from the associated node is placed on the new copy, so
553 -- that name resolution is not repeated.
555 -- Three kinds of source nodes have associated nodes:
557 -- a) those that can reference (denote) entities, that is identifiers,
558 -- character literals, expanded_names, operator symbols, operators,
559 -- and attribute reference nodes. These nodes have an Entity field
560 -- and are the set of nodes that are in N_Has_Entity.
562 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
564 -- c) selected components (N_Selected_Component)
566 -- For the first class, the associated node preserves the entity if it is
567 -- global. If the generic contains nested instantiations, the associated
568 -- node itself has been recopied, and a chain of them must be followed.
570 -- For aggregates, the associated node allows retrieval of the type, which
571 -- may otherwise not appear in the generic. The view of this type may be
572 -- different between generic and instantiation, and the full view can be
573 -- installed before the instantiation is analyzed. For aggregates of
574 -- type extensions, the same view exchange may have to be performed for
575 -- some of the ancestor types, if their view is private at the point of
578 -- Nodes that are selected components in the parse tree may be rewritten
579 -- as expanded names after resolution, and must be treated as potential
580 -- entity holders. which is why they also have an Associated_Node.
582 -- Nodes that do not come from source, such as freeze nodes, do not appear
583 -- in the generic tree, and need not have an associated node.
585 -- The associated node is stored in the Associated_Node field. Note that
586 -- this field overlaps Entity, which is fine, because the whole point is
587 -- that we don't need or want the normal Entity field in this situation.
589 procedure Move_Freeze_Nodes
593 -- Freeze nodes can be generated in the analysis of a generic unit, but
594 -- will not be seen by the back-end. It is necessary to move those nodes
595 -- to the enclosing scope if they freeze an outer entity. We place them
596 -- at the end of the enclosing generic package, which is semantically
599 procedure Pre_Analyze_Actuals
(N
: Node_Id
);
600 -- Analyze actuals to perform name resolution. Full resolution is done
601 -- later, when the expected types are known, but names have to be captured
602 -- before installing parents of generics, that are not visible for the
603 -- actuals themselves.
605 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
606 -- Verify that an attribute that appears as the default for a formal
607 -- subprogram is a function or procedure with the correct profile.
609 -------------------------------------------
610 -- Data Structures for Generic Renamings --
611 -------------------------------------------
613 -- The map Generic_Renamings associates generic entities with their
614 -- corresponding actuals. Currently used to validate type instances.
615 -- It will eventually be used for all generic parameters to eliminate
616 -- the need for overload resolution in the instance.
618 type Assoc_Ptr
is new Int
;
620 Assoc_Null
: constant Assoc_Ptr
:= -1;
625 Next_In_HTable
: Assoc_Ptr
;
628 package Generic_Renamings
is new Table
.Table
629 (Table_Component_Type
=> Assoc
,
630 Table_Index_Type
=> Assoc_Ptr
,
631 Table_Low_Bound
=> 0,
633 Table_Increment
=> 100,
634 Table_Name
=> "Generic_Renamings");
636 -- Variable to hold enclosing instantiation. When the environment is
637 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
639 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
641 -- Hash table for associations
643 HTable_Size
: constant := 37;
644 type HTable_Range
is range 0 .. HTable_Size
- 1;
646 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
647 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
648 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
649 function Hash
(F
: Entity_Id
) return HTable_Range
;
651 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
652 Header_Num
=> HTable_Range
,
654 Elmt_Ptr
=> Assoc_Ptr
,
655 Null_Ptr
=> Assoc_Null
,
656 Set_Next
=> Set_Next_Assoc
,
659 Get_Key
=> Get_Gen_Id
,
663 Exchanged_Views
: Elist_Id
;
664 -- This list holds the private views that have been exchanged during
665 -- instantiation to restore the visibility of the generic declaration.
666 -- (see comments above). After instantiation, the current visibility is
667 -- reestablished by means of a traversal of this list.
669 Hidden_Entities
: Elist_Id
;
670 -- This list holds the entities of the current scope that are removed
671 -- from immediate visibility when instantiating a child unit. Their
672 -- visibility is restored in Remove_Parent.
674 -- Because instantiations can be recursive, the following must be saved
675 -- on entry and restored on exit from an instantiation (spec or body).
676 -- This is done by the two procedures Save_Env and Restore_Env. For
677 -- package and subprogram instantiations (but not for the body instances)
678 -- the action of Save_Env is done in two steps: Init_Env is called before
679 -- Check_Generic_Child_Unit, because setting the parent instances requires
680 -- that the visibility data structures be properly initialized. Once the
681 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
683 type Instance_Env
is record
684 Ada_Version
: Ada_Version_Type
;
685 Instantiated_Parent
: Assoc
;
686 Exchanged_Views
: Elist_Id
;
687 Hidden_Entities
: Elist_Id
;
688 Current_Sem_Unit
: Unit_Number_Type
;
691 package Instance_Envs
is new Table
.Table
(
692 Table_Component_Type
=> Instance_Env
,
693 Table_Index_Type
=> Int
,
694 Table_Low_Bound
=> 0,
696 Table_Increment
=> 100,
697 Table_Name
=> "Instance_Envs");
699 procedure Restore_Private_Views
700 (Pack_Id
: Entity_Id
;
701 Is_Package
: Boolean := True);
702 -- Restore the private views of external types, and unmark the generic
703 -- renamings of actuals, so that they become comptible subtypes again.
704 -- For subprograms, Pack_Id is the package constructed to hold the
707 procedure Switch_View
(T
: Entity_Id
);
708 -- Switch the partial and full views of a type and its private
709 -- dependents (i.e. its subtypes and derived types).
711 ------------------------------------
712 -- Structures for Error Reporting --
713 ------------------------------------
715 Instantiation_Node
: Node_Id
;
716 -- Used by subprograms that validate instantiation of formal parameters
717 -- where there might be no actual on which to place the error message.
718 -- Also used to locate the instantiation node for generic subunits.
720 Instantiation_Error
: exception;
721 -- When there is a semantic error in the generic parameter matching,
722 -- there is no point in continuing the instantiation, because the
723 -- number of cascaded errors is unpredictable. This exception aborts
724 -- the instantiation process altogether.
726 S_Adjustment
: Sloc_Adjustment
;
727 -- Offset created for each node in an instantiation, in order to keep
728 -- track of the source position of the instantiation in each of its nodes.
729 -- A subsequent semantic error or warning on a construct of the instance
730 -- points to both places: the original generic node, and the point of
731 -- instantiation. See Sinput and Sinput.L for additional details.
733 ------------------------------------------------------------
734 -- Data structure for keeping track when inside a Generic --
735 ------------------------------------------------------------
737 -- The following table is used to save values of the Inside_A_Generic
738 -- flag (see spec of Sem) when they are saved by Start_Generic.
740 package Generic_Flags
is new Table
.Table
(
741 Table_Component_Type
=> Boolean,
742 Table_Index_Type
=> Int
,
743 Table_Low_Bound
=> 0,
745 Table_Increment
=> 200,
746 Table_Name
=> "Generic_Flags");
748 ---------------------------
749 -- Abandon_Instantiation --
750 ---------------------------
752 procedure Abandon_Instantiation
(N
: Node_Id
) is
754 Error_Msg_N
("instantiation abandoned!", N
);
755 raise Instantiation_Error
;
756 end Abandon_Instantiation
;
758 --------------------------
759 -- Analyze_Associations --
760 --------------------------
762 function Analyze_Associations
765 F_Copy
: List_Id
) return List_Id
767 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
768 Assoc
: constant List_Id
:= New_List
;
769 Defaults
: constant Elist_Id
:= New_Elmt_List
;
770 Gen_Unit
: constant Entity_Id
:= Defining_Entity
(Parent
(F_Copy
));
774 Next_Formal
: Node_Id
;
775 Temp_Formal
: Node_Id
;
776 Analyzed_Formal
: Node_Id
;
779 First_Named
: Node_Id
:= Empty
;
780 Found_Assoc
: Node_Id
;
781 Is_Named_Assoc
: Boolean;
782 Num_Matched
: Int
:= 0;
783 Num_Actuals
: Int
:= 0;
785 function Matching_Actual
787 A_F
: Entity_Id
) return Node_Id
;
788 -- Find actual that corresponds to a given a formal parameter. If the
789 -- actuals are positional, return the next one, if any. If the actuals
790 -- are named, scan the parameter associations to find the right one.
791 -- A_F is the corresponding entity in the analyzed generic,which is
792 -- placed on the selector name for ASIS use.
794 procedure Set_Analyzed_Formal
;
795 -- Find the node in the generic copy that corresponds to a given formal.
796 -- The semantic information on this node is used to perform legality
797 -- checks on the actuals. Because semantic analysis can introduce some
798 -- anonymous entities or modify the declaration node itself, the
799 -- correspondence between the two lists is not one-one. In addition to
800 -- anonymous types, the presence a formal equality will introduce an
801 -- implicit declaration for the corresponding inequality.
803 ---------------------
804 -- Matching_Actual --
805 ---------------------
807 function Matching_Actual
809 A_F
: Entity_Id
) return Node_Id
815 Is_Named_Assoc
:= False;
817 -- End of list of purely positional parameters
822 -- Case of positional parameter corresponding to current formal
824 elsif No
(Selector_Name
(Actual
)) then
825 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
826 Found_Assoc
:= Actual
;
827 Num_Matched
:= Num_Matched
+ 1;
830 -- Otherwise scan list of named actuals to find the one with the
831 -- desired name. All remaining actuals have explicit names.
834 Is_Named_Assoc
:= True;
838 while Present
(Actual
) loop
839 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
840 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
841 Set_Entity
(Selector_Name
(Actual
), A_F
);
842 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
843 Generate_Reference
(A_F
, Selector_Name
(Actual
));
844 Found_Assoc
:= Actual
;
845 Num_Matched
:= Num_Matched
+ 1;
853 -- Reset for subsequent searches. In most cases the named
854 -- associations are in order. If they are not, we reorder them
855 -- to avoid scanning twice the same actual. This is not just a
856 -- question of efficiency: there may be multiple defaults with
857 -- boxes that have the same name. In a nested instantiation we
858 -- insert actuals for those defaults, and cannot rely on their
859 -- names to disambiguate them.
861 if Actual
= First_Named
then
864 elsif Present
(Actual
) then
865 Insert_Before
(First_Named
, Remove_Next
(Prev
));
868 Actual
:= First_Named
;
874 -------------------------
875 -- Set_Analyzed_Formal --
876 -------------------------
878 procedure Set_Analyzed_Formal
is
881 while Present
(Analyzed_Formal
) loop
882 Kind
:= Nkind
(Analyzed_Formal
);
884 case Nkind
(Formal
) is
886 when N_Formal_Subprogram_Declaration
=>
887 exit when Kind
in N_Formal_Subprogram_Declaration
890 (Defining_Unit_Name
(Specification
(Formal
))) =
892 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
894 when N_Formal_Package_Declaration
=>
896 Kind
= N_Formal_Package_Declaration
898 Kind
= N_Generic_Package_Declaration
;
900 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
904 -- Skip freeze nodes, and nodes inserted to replace
905 -- unrecognized pragmas.
908 Kind
not in N_Formal_Subprogram_Declaration
909 and then Kind
/= N_Subprogram_Declaration
910 and then Kind
/= N_Freeze_Entity
911 and then Kind
/= N_Null_Statement
912 and then Kind
/= N_Itype_Reference
913 and then Chars
(Defining_Identifier
(Formal
)) =
914 Chars
(Defining_Identifier
(Analyzed_Formal
));
917 Next
(Analyzed_Formal
);
920 end Set_Analyzed_Formal
;
922 -- Start of processing for Analyze_Associations
925 -- If named associations are present, save the first named association
926 -- (it may of course be Empty) to facilitate subsequent name search.
928 Actuals
:= Generic_Associations
(I_Node
);
930 if Present
(Actuals
) then
931 First_Named
:= First
(Actuals
);
933 while Present
(First_Named
)
934 and then No
(Selector_Name
(First_Named
))
936 Num_Actuals
:= Num_Actuals
+ 1;
941 Named
:= First_Named
;
942 while Present
(Named
) loop
943 if No
(Selector_Name
(Named
)) then
944 Error_Msg_N
("invalid positional actual after named one", Named
);
945 Abandon_Instantiation
(Named
);
948 -- A named association may lack an actual parameter, if it was
949 -- introduced for a default subprogram that turns out to be local
950 -- to the outer instantiation.
952 if Present
(Explicit_Generic_Actual_Parameter
(Named
)) then
953 Num_Actuals
:= Num_Actuals
+ 1;
959 if Present
(Formals
) then
960 Formal
:= First_Non_Pragma
(Formals
);
961 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
963 if Present
(Actuals
) then
964 Actual
:= First
(Actuals
);
966 -- All formals should have default values
972 while Present
(Formal
) loop
974 Next_Formal
:= Next_Non_Pragma
(Formal
);
976 case Nkind
(Formal
) is
977 when N_Formal_Object_Declaration
=>
980 Defining_Identifier
(Formal
),
981 Defining_Identifier
(Analyzed_Formal
));
984 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
987 when N_Formal_Type_Declaration
=>
990 Defining_Identifier
(Formal
),
991 Defining_Identifier
(Analyzed_Formal
));
994 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
997 Instantiation_Node
, Defining_Identifier
(Formal
));
998 Error_Msg_NE
("\in instantiation of & declared#",
999 Instantiation_Node
, Gen_Unit
);
1000 Abandon_Instantiation
(Instantiation_Node
);
1006 (Formal
, Match
, Analyzed_Formal
, Assoc
));
1008 -- an instantiation is a freeze point for the actuals,
1009 -- unless this is a rewritten formal package.
1011 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1012 Append_Elmt
(Entity
(Match
), Actual_Types
);
1016 -- A remote access-to-class-wide type must not be an
1017 -- actual parameter for a generic formal of an access
1018 -- type (E.2.2 (17)).
1020 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1022 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1023 N_Access_To_Object_Definition
1025 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1028 when N_Formal_Subprogram_Declaration
=>
1031 Defining_Unit_Name
(Specification
(Formal
)),
1032 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1034 -- If the formal subprogram has the same name as
1035 -- another formal subprogram of the generic, then
1036 -- a named association is illegal (12.3(9)). Exclude
1037 -- named associations that are generated for a nested
1041 and then Is_Named_Assoc
1042 and then Comes_From_Source
(Found_Assoc
)
1044 Temp_Formal
:= First
(Formals
);
1045 while Present
(Temp_Formal
) loop
1046 if Nkind
(Temp_Formal
) in
1047 N_Formal_Subprogram_Declaration
1048 and then Temp_Formal
/= Formal
1050 Chars
(Selector_Name
(Found_Assoc
)) =
1051 Chars
(Defining_Unit_Name
1052 (Specification
(Temp_Formal
)))
1055 ("name not allowed for overloaded formal",
1057 Abandon_Instantiation
(Instantiation_Node
);
1065 Instantiate_Formal_Subprogram
1066 (Formal
, Match
, Analyzed_Formal
));
1069 and then Box_Present
(Formal
)
1072 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1076 when N_Formal_Package_Declaration
=>
1079 Defining_Identifier
(Formal
),
1080 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1083 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1086 Instantiation_Node
, Defining_Identifier
(Formal
));
1087 Error_Msg_NE
("\in instantiation of & declared#",
1088 Instantiation_Node
, Gen_Unit
);
1090 Abandon_Instantiation
(Instantiation_Node
);
1095 (Instantiate_Formal_Package
1096 (Formal
, Match
, Analyzed_Formal
),
1100 -- For use type and use package appearing in the context
1101 -- clause, we have already copied them, so we can just
1102 -- move them where they belong (we mustn't recopy them
1103 -- since this would mess up the Sloc values).
1105 when N_Use_Package_Clause |
1106 N_Use_Type_Clause
=>
1108 Append
(Formal
, Assoc
);
1111 raise Program_Error
;
1115 Formal
:= Next_Formal
;
1116 Next_Non_Pragma
(Analyzed_Formal
);
1119 if Num_Actuals
> Num_Matched
then
1120 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1122 if Present
(Selector_Name
(Actual
)) then
1124 ("unmatched actual&",
1125 Actual
, Selector_Name
(Actual
));
1126 Error_Msg_NE
("\in instantiation of& declared#",
1130 ("unmatched actual in instantiation of& declared#",
1135 elsif Present
(Actuals
) then
1137 ("too many actuals in generic instantiation", Instantiation_Node
);
1141 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1144 while Present
(Elmt
) loop
1145 Freeze_Before
(I_Node
, Node
(Elmt
));
1150 -- If there are default subprograms, normalize the tree by adding
1151 -- explicit associations for them. This is required if the instance
1152 -- appears within a generic.
1160 Elmt
:= First_Elmt
(Defaults
);
1161 while Present
(Elmt
) loop
1162 if No
(Actuals
) then
1163 Actuals
:= New_List
;
1164 Set_Generic_Associations
(I_Node
, Actuals
);
1167 Subp
:= Node
(Elmt
);
1169 Make_Generic_Association
(Sloc
(Subp
),
1170 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1171 Explicit_Generic_Actual_Parameter
=>
1172 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1173 Mark_Rewrite_Insertion
(New_D
);
1174 Append_To
(Actuals
, New_D
);
1180 end Analyze_Associations
;
1182 -------------------------------
1183 -- Analyze_Formal_Array_Type --
1184 -------------------------------
1186 procedure Analyze_Formal_Array_Type
1187 (T
: in out Entity_Id
;
1193 -- Treated like a non-generic array declaration, with
1194 -- additional semantic checks.
1198 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1199 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1200 while Present
(DSS
) loop
1201 if Nkind
(DSS
) = N_Subtype_Indication
1202 or else Nkind
(DSS
) = N_Range
1203 or else Nkind
(DSS
) = N_Attribute_Reference
1205 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1212 Array_Type_Declaration
(T
, Def
);
1213 Set_Is_Generic_Type
(Base_Type
(T
));
1215 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1216 and then No
(Full_View
(Component_Type
(T
)))
1218 Error_Msg_N
("premature usage of incomplete type", Def
);
1220 -- Check that range constraint is not allowed on the component type
1221 -- of a generic formal array type (AARM 12.5.3(3))
1223 elsif Is_Internal
(Component_Type
(T
))
1224 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1225 and then Nkind
(Original_Node
1226 (Subtype_Indication
(Component_Definition
(Def
))))
1227 = N_Subtype_Indication
1230 ("in a formal, a subtype indication can only be "
1231 & "a subtype mark ('R'M 12.5.3(3))",
1232 Subtype_Indication
(Component_Definition
(Def
)));
1235 end Analyze_Formal_Array_Type
;
1237 ---------------------------------------------
1238 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1239 ---------------------------------------------
1241 -- As for other generic types, we create a valid type representation
1242 -- with legal but arbitrary attributes, whose values are never considered
1243 -- static. For all scalar types we introduce an anonymous base type, with
1244 -- the same attributes. We choose the corresponding integer type to be
1245 -- Standard_Integer.
1247 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1251 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1252 Base
: constant Entity_Id
:=
1254 (E_Decimal_Fixed_Point_Type
,
1255 Current_Scope
, Sloc
(Def
), 'G');
1256 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1257 Delta_Val
: constant Ureal
:= Ureal_1
;
1258 Digs_Val
: constant Uint
:= Uint_6
;
1263 Set_Etype
(Base
, Base
);
1264 Set_Size_Info
(Base
, Int_Base
);
1265 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1266 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1267 Set_Digits_Value
(Base
, Digs_Val
);
1268 Set_Delta_Value
(Base
, Delta_Val
);
1269 Set_Small_Value
(Base
, Delta_Val
);
1270 Set_Scalar_Range
(Base
,
1272 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1273 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1275 Set_Is_Generic_Type
(Base
);
1276 Set_Parent
(Base
, Parent
(Def
));
1278 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1279 Set_Etype
(T
, Base
);
1280 Set_Size_Info
(T
, Int_Base
);
1281 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1282 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1283 Set_Digits_Value
(T
, Digs_Val
);
1284 Set_Delta_Value
(T
, Delta_Val
);
1285 Set_Small_Value
(T
, Delta_Val
);
1286 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1287 Set_Is_Constrained
(T
);
1289 Check_Restriction
(No_Fixed_Point
, Def
);
1290 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1292 ---------------------------------
1293 -- Analyze_Formal_Derived_Type --
1294 ---------------------------------
1296 procedure Analyze_Formal_Derived_Type
1301 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1302 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1306 Set_Is_Generic_Type
(T
);
1308 if Private_Present
(Def
) then
1310 Make_Private_Extension_Declaration
(Loc
,
1311 Defining_Identifier
=> T
,
1312 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1313 Unknown_Discriminants_Present
=> Unk_Disc
,
1314 Subtype_Indication
=> Subtype_Mark
(Def
));
1316 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1320 Make_Full_Type_Declaration
(Loc
,
1321 Defining_Identifier
=> T
,
1322 Discriminant_Specifications
=>
1323 Discriminant_Specifications
(Parent
(T
)),
1325 Make_Derived_Type_Definition
(Loc
,
1326 Subtype_Indication
=> Subtype_Mark
(Def
)));
1328 Set_Abstract_Present
1329 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1336 if not Is_Composite_Type
(T
) then
1338 ("unknown discriminants not allowed for elementary types", N
);
1340 Set_Has_Unknown_Discriminants
(T
);
1341 Set_Is_Constrained
(T
, False);
1345 -- If the parent type has a known size, so does the formal, which
1346 -- makes legal representation clauses that involve the formal.
1348 Set_Size_Known_At_Compile_Time
1349 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1351 end Analyze_Formal_Derived_Type
;
1353 ----------------------------------
1354 -- Analyze_Formal_Discrete_Type --
1355 ----------------------------------
1357 -- The operations defined for a discrete types are those of an
1358 -- enumeration type. The size is set to an arbitrary value, for use
1359 -- in analyzing the generic unit.
1361 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1362 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1366 Base
: constant Entity_Id
:=
1368 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1371 Set_Ekind
(T
, E_Enumeration_Subtype
);
1372 Set_Etype
(T
, Base
);
1375 Set_Is_Generic_Type
(T
);
1376 Set_Is_Constrained
(T
);
1378 -- For semantic analysis, the bounds of the type must be set to some
1379 -- non-static value. The simplest is to create attribute nodes for
1380 -- those bounds, that refer to the type itself. These bounds are never
1381 -- analyzed but serve as place-holders.
1384 Make_Attribute_Reference
(Loc
,
1385 Attribute_Name
=> Name_First
,
1386 Prefix
=> New_Reference_To
(T
, Loc
));
1390 Make_Attribute_Reference
(Loc
,
1391 Attribute_Name
=> Name_Last
,
1392 Prefix
=> New_Reference_To
(T
, Loc
));
1395 Set_Scalar_Range
(T
,
1400 Set_Ekind
(Base
, E_Enumeration_Type
);
1401 Set_Etype
(Base
, Base
);
1402 Init_Size
(Base
, 8);
1403 Init_Alignment
(Base
);
1404 Set_Is_Generic_Type
(Base
);
1405 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1406 Set_Parent
(Base
, Parent
(Def
));
1408 end Analyze_Formal_Discrete_Type
;
1410 ----------------------------------
1411 -- Analyze_Formal_Floating_Type --
1412 ---------------------------------
1414 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1415 Base
: constant Entity_Id
:=
1417 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1420 -- The various semantic attributes are taken from the predefined type
1421 -- Float, just so that all of them are initialized. Their values are
1422 -- never used because no constant folding or expansion takes place in
1423 -- the generic itself.
1426 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1427 Set_Etype
(T
, Base
);
1428 Set_Size_Info
(T
, (Standard_Float
));
1429 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1430 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1431 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1432 Set_Is_Constrained
(T
);
1434 Set_Is_Generic_Type
(Base
);
1435 Set_Etype
(Base
, Base
);
1436 Set_Size_Info
(Base
, (Standard_Float
));
1437 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1438 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1439 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1440 Set_Parent
(Base
, Parent
(Def
));
1442 Check_Restriction
(No_Floating_Point
, Def
);
1443 end Analyze_Formal_Floating_Type
;
1445 ---------------------------------
1446 -- Analyze_Formal_Modular_Type --
1447 ---------------------------------
1449 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1451 -- Apart from their entity kind, generic modular types are treated
1452 -- like signed integer types, and have the same attributes.
1454 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1455 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1456 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1458 end Analyze_Formal_Modular_Type
;
1460 ---------------------------------------
1461 -- Analyze_Formal_Object_Declaration --
1462 ---------------------------------------
1464 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1465 E
: constant Node_Id
:= Expression
(N
);
1466 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1473 -- Determine the mode of the formal object
1475 if Out_Present
(N
) then
1476 K
:= E_Generic_In_Out_Parameter
;
1478 if not In_Present
(N
) then
1479 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1483 K
:= E_Generic_In_Parameter
;
1486 Find_Type
(Subtype_Mark
(N
));
1487 T
:= Entity
(Subtype_Mark
(N
));
1489 if Ekind
(T
) = E_Incomplete_Type
then
1490 Error_Msg_N
("premature usage of incomplete type", Subtype_Mark
(N
));
1493 if K
= E_Generic_In_Parameter
then
1495 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1497 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1499 ("generic formal of mode IN must not be of limited type", N
);
1500 Explain_Limited_Type
(T
, N
);
1503 if Is_Abstract
(T
) then
1505 ("generic formal of mode IN must not be of abstract type", N
);
1509 Analyze_Per_Use_Expression
(E
, T
);
1515 -- Case of generic IN OUT parameter.
1518 -- If the formal has an unconstrained type, construct its
1519 -- actual subtype, as is done for subprogram formals. In this
1520 -- fashion, all its uses can refer to specific bounds.
1525 if (Is_Array_Type
(T
)
1526 and then not Is_Constrained
(T
))
1528 (Ekind
(T
) = E_Record_Type
1529 and then Has_Discriminants
(T
))
1532 Non_Freezing_Ref
: constant Node_Id
:=
1533 New_Reference_To
(Id
, Sloc
(Id
));
1537 -- Make sure that the actual subtype doesn't generate
1540 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1541 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1542 Insert_Before_And_Analyze
(N
, Decl
);
1543 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1546 Set_Actual_Subtype
(Id
, T
);
1551 ("initialization not allowed for `IN OUT` formals", N
);
1555 end Analyze_Formal_Object_Declaration
;
1557 ----------------------------------------------
1558 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1559 ----------------------------------------------
1561 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1565 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1566 Base
: constant Entity_Id
:=
1568 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1570 -- The semantic attributes are set for completeness only, their
1571 -- values will never be used, because all properties of the type
1575 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1576 Set_Etype
(T
, Base
);
1577 Set_Size_Info
(T
, Standard_Integer
);
1578 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1579 Set_Small_Value
(T
, Ureal_1
);
1580 Set_Delta_Value
(T
, Ureal_1
);
1581 Set_Scalar_Range
(T
,
1583 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1584 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1585 Set_Is_Constrained
(T
);
1587 Set_Is_Generic_Type
(Base
);
1588 Set_Etype
(Base
, Base
);
1589 Set_Size_Info
(Base
, Standard_Integer
);
1590 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1591 Set_Small_Value
(Base
, Ureal_1
);
1592 Set_Delta_Value
(Base
, Ureal_1
);
1593 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1594 Set_Parent
(Base
, Parent
(Def
));
1596 Check_Restriction
(No_Fixed_Point
, Def
);
1597 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1599 ----------------------------
1600 -- Analyze_Formal_Package --
1601 ----------------------------
1603 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1604 Loc
: constant Source_Ptr
:= Sloc
(N
);
1605 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1607 Gen_Id
: constant Node_Id
:= Name
(N
);
1609 Gen_Unit
: Entity_Id
;
1611 Parent_Installed
: Boolean := False;
1613 Parent_Instance
: Entity_Id
;
1614 Renaming_In_Par
: Entity_Id
;
1617 Text_IO_Kludge
(Gen_Id
);
1620 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
1621 Gen_Unit
:= Entity
(Gen_Id
);
1623 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
1624 Error_Msg_N
("expect generic package name", Gen_Id
);
1628 elsif Gen_Unit
= Current_Scope
then
1630 ("generic package cannot be used as a formal package of itself",
1635 elsif In_Open_Scopes
(Gen_Unit
) then
1636 if Is_Compilation_Unit
(Gen_Unit
)
1637 and then Is_Child_Unit
(Current_Scope
)
1639 -- Special-case the error when the formal is a parent, and
1640 -- continue analysis to minimize cascaded errors.
1643 ("generic parent cannot be used as formal package "
1644 & "of a child unit",
1649 ("generic package cannot be used as a formal package "
1657 -- Check for a formal package that is a package renaming.
1659 if Present
(Renamed_Object
(Gen_Unit
)) then
1660 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
1663 -- The formal package is treated like a regular instance, but only
1664 -- the specification needs to be instantiated, to make entities visible.
1666 if not Box_Present
(N
) then
1667 Hidden_Entities
:= New_Elmt_List
;
1668 Analyze_Package_Instantiation
(N
);
1670 if Parent_Installed
then
1675 -- If there are no generic associations, the generic parameters
1676 -- appear as local entities and are instantiated like them. We copy
1677 -- the generic package declaration as if it were an instantiation,
1678 -- and analyze it like a regular package, except that we treat the
1679 -- formals as additional visible components.
1681 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
1683 if In_Extended_Main_Source_Unit
(N
) then
1684 Set_Is_Instantiated
(Gen_Unit
);
1685 Generate_Reference
(Gen_Unit
, N
);
1688 Formal
:= New_Copy
(Pack_Id
);
1691 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
1693 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
1694 Set_Instance_Env
(Gen_Unit
, Formal
);
1696 Enter_Name
(Formal
);
1697 Set_Ekind
(Formal
, E_Generic_Package
);
1698 Set_Etype
(Formal
, Standard_Void_Type
);
1699 Set_Inner_Instances
(Formal
, New_Elmt_List
);
1702 -- Within the formal, the name of the generic package is a renaming
1703 -- of the formal (as for a regular instantiation).
1705 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1706 Defining_Unit_Name
=>
1707 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1708 Name
=> New_Reference_To
(Formal
, Loc
));
1710 if Present
(Visible_Declarations
(Specification
(N
))) then
1711 Prepend
(Renaming
, To
=> Visible_Declarations
(Specification
(N
)));
1712 elsif Present
(Private_Declarations
(Specification
(N
))) then
1713 Prepend
(Renaming
, To
=> Private_Declarations
(Specification
(N
)));
1716 if Is_Child_Unit
(Gen_Unit
)
1717 and then Parent_Installed
1719 -- Similarly, we have to make the name of the formal visible in
1720 -- the parent instance, to resolve properly fully qualified names
1721 -- that may appear in the generic unit. The parent instance has
1722 -- been placed on the scope stack ahead of the current scope.
1724 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
1727 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
1728 Set_Ekind
(Renaming_In_Par
, E_Package
);
1729 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
1730 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
1731 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
1732 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
1733 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
1736 Analyze_Generic_Formal_Part
(N
);
1737 Analyze
(Specification
(N
));
1738 End_Package_Scope
(Formal
);
1740 if Parent_Installed
then
1746 -- Inside the generic unit, the formal package is a regular
1747 -- package, but no body is needed for it. Note that after
1748 -- instantiation, the defining_unit_name we need is in the
1749 -- new tree and not in the original. (see Package_Instantiation).
1750 -- A generic formal package is an instance, and can be used as
1751 -- an actual for an inner instance. Mark its generic parent.
1753 Set_Ekind
(Formal
, E_Package
);
1754 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
1755 Set_Has_Completion
(Formal
, True);
1757 Set_Ekind
(Pack_Id
, E_Package
);
1758 Set_Etype
(Pack_Id
, Standard_Void_Type
);
1759 Set_Scope
(Pack_Id
, Scope
(Formal
));
1760 Set_Has_Completion
(Pack_Id
, True);
1762 end Analyze_Formal_Package
;
1764 ---------------------------------
1765 -- Analyze_Formal_Private_Type --
1766 ---------------------------------
1768 procedure Analyze_Formal_Private_Type
1774 New_Private_Type
(N
, T
, Def
);
1776 -- Set the size to an arbitrary but legal value.
1778 Set_Size_Info
(T
, Standard_Integer
);
1779 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1780 end Analyze_Formal_Private_Type
;
1782 ----------------------------------------
1783 -- Analyze_Formal_Signed_Integer_Type --
1784 ----------------------------------------
1786 procedure Analyze_Formal_Signed_Integer_Type
1790 Base
: constant Entity_Id
:=
1792 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
1797 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
1798 Set_Etype
(T
, Base
);
1799 Set_Size_Info
(T
, Standard_Integer
);
1800 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1801 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
1802 Set_Is_Constrained
(T
);
1804 Set_Is_Generic_Type
(Base
);
1805 Set_Size_Info
(Base
, Standard_Integer
);
1806 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1807 Set_Etype
(Base
, Base
);
1808 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
1809 Set_Parent
(Base
, Parent
(Def
));
1810 end Analyze_Formal_Signed_Integer_Type
;
1812 -------------------------------
1813 -- Analyze_Formal_Subprogram --
1814 -------------------------------
1816 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
1817 Spec
: constant Node_Id
:= Specification
(N
);
1818 Def
: constant Node_Id
:= Default_Name
(N
);
1819 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
1827 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
1828 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
1832 Analyze_Subprogram_Declaration
(N
);
1833 Set_Is_Formal_Subprogram
(Nam
);
1834 Set_Has_Completion
(Nam
);
1836 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
1837 Set_Is_Abstract
(Nam
);
1838 Set_Is_Dispatching_Operation
(Nam
);
1841 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
1844 if not Present
(Ctrl_Type
) then
1846 ("abstract formal subprogram must have a controlling type",
1850 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
1855 -- Default name is resolved at the point of instantiation
1857 if Box_Present
(N
) then
1860 -- Else default is bound at the point of generic declaration
1862 elsif Present
(Def
) then
1863 if Nkind
(Def
) = N_Operator_Symbol
then
1864 Find_Direct_Name
(Def
);
1866 elsif Nkind
(Def
) /= N_Attribute_Reference
then
1870 -- For an attribute reference, analyze the prefix and verify
1871 -- that it has the proper profile for the subprogram.
1873 Analyze
(Prefix
(Def
));
1874 Valid_Default_Attribute
(Nam
, Def
);
1878 -- Default name may be overloaded, in which case the interpretation
1879 -- with the correct profile must be selected, as for a renaming.
1881 if Etype
(Def
) = Any_Type
then
1884 elsif Nkind
(Def
) = N_Selected_Component
then
1885 Subp
:= Entity
(Selector_Name
(Def
));
1887 if Ekind
(Subp
) /= E_Entry
then
1888 Error_Msg_N
("expect valid subprogram name as default", Def
);
1892 elsif Nkind
(Def
) = N_Indexed_Component
then
1894 if Nkind
(Prefix
(Def
)) /= N_Selected_Component
then
1895 Error_Msg_N
("expect valid subprogram name as default", Def
);
1899 Subp
:= Entity
(Selector_Name
(Prefix
(Def
)));
1901 if Ekind
(Subp
) /= E_Entry_Family
then
1902 Error_Msg_N
("expect valid subprogram name as default", Def
);
1907 elsif Nkind
(Def
) = N_Character_Literal
then
1909 -- Needs some type checks: subprogram should be parameterless???
1911 Resolve
(Def
, (Etype
(Nam
)));
1913 elsif not Is_Entity_Name
(Def
)
1914 or else not Is_Overloadable
(Entity
(Def
))
1916 Error_Msg_N
("expect valid subprogram name as default", Def
);
1919 elsif not Is_Overloaded
(Def
) then
1920 Subp
:= Entity
(Def
);
1923 Error_Msg_N
("premature usage of formal subprogram", Def
);
1925 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
1926 Error_Msg_N
("no visible entity matches specification", Def
);
1932 I1
: Interp_Index
:= 0;
1938 Get_First_Interp
(Def
, I
, It
);
1939 while Present
(It
.Nam
) loop
1941 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
1942 if Subp
/= Any_Id
then
1943 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
1945 if It1
= No_Interp
then
1946 Error_Msg_N
("ambiguous default subprogram", Def
);
1959 Get_Next_Interp
(I
, It
);
1963 if Subp
/= Any_Id
then
1964 Set_Entity
(Def
, Subp
);
1967 Error_Msg_N
("premature usage of formal subprogram", Def
);
1969 elsif Ekind
(Subp
) /= E_Operator
then
1970 Check_Mode_Conformant
(Subp
, Nam
);
1974 Error_Msg_N
("no visible subprogram matches specification", N
);
1978 end Analyze_Formal_Subprogram
;
1980 -------------------------------------
1981 -- Analyze_Formal_Type_Declaration --
1982 -------------------------------------
1984 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
1985 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
1989 T
:= Defining_Identifier
(N
);
1991 if Present
(Discriminant_Specifications
(N
))
1992 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
1995 ("discriminants not allowed for this formal type",
1996 Defining_Identifier
(First
(Discriminant_Specifications
(N
))));
1999 -- Enter the new name, and branch to specific routine.
2002 when N_Formal_Private_Type_Definition
=>
2003 Analyze_Formal_Private_Type
(N
, T
, Def
);
2005 when N_Formal_Derived_Type_Definition
=>
2006 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2008 when N_Formal_Discrete_Type_Definition
=>
2009 Analyze_Formal_Discrete_Type
(T
, Def
);
2011 when N_Formal_Signed_Integer_Type_Definition
=>
2012 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2014 when N_Formal_Modular_Type_Definition
=>
2015 Analyze_Formal_Modular_Type
(T
, Def
);
2017 when N_Formal_Floating_Point_Definition
=>
2018 Analyze_Formal_Floating_Type
(T
, Def
);
2020 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2021 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2023 when N_Formal_Decimal_Fixed_Point_Definition
=>
2024 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2026 when N_Array_Type_Definition
=>
2027 Analyze_Formal_Array_Type
(T
, Def
);
2029 when N_Access_To_Object_Definition |
2030 N_Access_Function_Definition |
2031 N_Access_Procedure_Definition
=>
2032 Analyze_Generic_Access_Type
(T
, Def
);
2038 raise Program_Error
;
2042 Set_Is_Generic_Type
(T
);
2043 end Analyze_Formal_Type_Declaration
;
2045 ------------------------------------
2046 -- Analyze_Function_Instantiation --
2047 ------------------------------------
2049 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2051 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2052 end Analyze_Function_Instantiation
;
2054 ---------------------------------
2055 -- Analyze_Generic_Access_Type --
2056 ---------------------------------
2058 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2062 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2063 Access_Type_Declaration
(T
, Def
);
2065 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2066 and then No
(Full_View
(Designated_Type
(T
)))
2067 and then not Is_Generic_Type
(Designated_Type
(T
))
2069 Error_Msg_N
("premature usage of incomplete type", Def
);
2071 elsif Is_Internal
(Designated_Type
(T
)) then
2073 ("only a subtype mark is allowed in a formal", Def
);
2077 Access_Subprogram_Declaration
(T
, Def
);
2079 end Analyze_Generic_Access_Type
;
2081 ---------------------------------
2082 -- Analyze_Generic_Formal_Part --
2083 ---------------------------------
2085 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2086 Gen_Parm_Decl
: Node_Id
;
2089 -- The generic formals are processed in the scope of the generic
2090 -- unit, where they are immediately visible. The scope is installed
2093 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2095 while Present
(Gen_Parm_Decl
) loop
2096 Analyze
(Gen_Parm_Decl
);
2097 Next
(Gen_Parm_Decl
);
2100 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2101 end Analyze_Generic_Formal_Part
;
2103 ------------------------------------------
2104 -- Analyze_Generic_Package_Declaration --
2105 ------------------------------------------
2107 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2108 Loc
: constant Source_Ptr
:= Sloc
(N
);
2111 Save_Parent
: Node_Id
;
2113 Decls
: constant List_Id
:=
2114 Visible_Declarations
(Specification
(N
));
2118 -- We introduce a renaming of the enclosing package, to have a usable
2119 -- entity as the prefix of an expanded name for a local entity of the
2120 -- form Par.P.Q, where P is the generic package. This is because a local
2121 -- entity named P may hide it, so that the usual visibility rules in
2122 -- the instance will not resolve properly.
2125 Make_Package_Renaming_Declaration
(Loc
,
2126 Defining_Unit_Name
=>
2127 Make_Defining_Identifier
(Loc
,
2128 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2129 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2131 if Present
(Decls
) then
2132 Decl
:= First
(Decls
);
2133 while Present
(Decl
)
2134 and then Nkind
(Decl
) = N_Pragma
2139 if Present
(Decl
) then
2140 Insert_Before
(Decl
, Renaming
);
2142 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2146 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2149 -- Create copy of generic unit, and save for instantiation.
2150 -- If the unit is a child unit, do not copy the specifications
2151 -- for the parent, which are not part of the generic tree.
2153 Save_Parent
:= Parent_Spec
(N
);
2154 Set_Parent_Spec
(N
, Empty
);
2156 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2157 Set_Parent_Spec
(New_N
, Save_Parent
);
2159 Id
:= Defining_Entity
(N
);
2160 Generate_Definition
(Id
);
2162 -- Expansion is not applied to generic units.
2167 Set_Ekind
(Id
, E_Generic_Package
);
2168 Set_Etype
(Id
, Standard_Void_Type
);
2170 Enter_Generic_Scope
(Id
);
2171 Set_Inner_Instances
(Id
, New_Elmt_List
);
2173 Set_Categorization_From_Pragmas
(N
);
2174 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2176 -- Link the declaration of the generic homonym in the generic copy
2177 -- to the package it renames, so that it is always resolved properly.
2179 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2180 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2182 -- For a library unit, we have reconstructed the entity for the
2183 -- unit, and must reset it in the library tables.
2185 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2186 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2189 Analyze_Generic_Formal_Part
(N
);
2191 -- After processing the generic formals, analysis proceeds
2192 -- as for a non-generic package.
2194 Analyze
(Specification
(N
));
2196 Validate_Categorization_Dependency
(N
, Id
);
2200 End_Package_Scope
(Id
);
2201 Exit_Generic_Scope
(Id
);
2203 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2204 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2205 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2206 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2209 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2210 Validate_RT_RAT_Component
(N
);
2212 -- If this is a spec without a body, check that generic parameters
2215 if not Body_Required
(Parent
(N
)) then
2216 Check_References
(Id
);
2219 end Analyze_Generic_Package_Declaration
;
2221 --------------------------------------------
2222 -- Analyze_Generic_Subprogram_Declaration --
2223 --------------------------------------------
2225 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2230 Save_Parent
: Node_Id
;
2233 -- Create copy of generic unit,and save for instantiation.
2234 -- If the unit is a child unit, do not copy the specifications
2235 -- for the parent, which are not part of the generic tree.
2237 Save_Parent
:= Parent_Spec
(N
);
2238 Set_Parent_Spec
(N
, Empty
);
2240 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2241 Set_Parent_Spec
(New_N
, Save_Parent
);
2244 Spec
:= Specification
(N
);
2245 Id
:= Defining_Entity
(Spec
);
2246 Generate_Definition
(Id
);
2248 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2250 ("operator symbol not allowed for generic subprogram", Id
);
2257 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2259 Enter_Generic_Scope
(Id
);
2260 Set_Inner_Instances
(Id
, New_Elmt_List
);
2261 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2263 Analyze_Generic_Formal_Part
(N
);
2265 Formals
:= Parameter_Specifications
(Spec
);
2267 if Present
(Formals
) then
2268 Process_Formals
(Formals
, Spec
);
2271 if Nkind
(Spec
) = N_Function_Specification
then
2272 Set_Ekind
(Id
, E_Generic_Function
);
2273 Find_Type
(Subtype_Mark
(Spec
));
2274 Set_Etype
(Id
, Entity
(Subtype_Mark
(Spec
)));
2276 Set_Ekind
(Id
, E_Generic_Procedure
);
2277 Set_Etype
(Id
, Standard_Void_Type
);
2280 -- For a library unit, we have reconstructed the entity for the
2281 -- unit, and must reset it in the library tables. We also need
2282 -- to make sure that Body_Required is set properly in the original
2283 -- compilation unit node.
2285 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2286 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2287 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2290 Set_Categorization_From_Pragmas
(N
);
2291 Validate_Categorization_Dependency
(N
, Id
);
2293 Save_Global_References
(Original_Node
(N
));
2297 Exit_Generic_Scope
(Id
);
2298 Generate_Reference_To_Formals
(Id
);
2299 end Analyze_Generic_Subprogram_Declaration
;
2301 -----------------------------------
2302 -- Analyze_Package_Instantiation --
2303 -----------------------------------
2305 -- Note: this procedure is also used for formal package declarations,
2306 -- in which case the argument N is an N_Formal_Package_Declaration
2307 -- node. This should really be noted in the spec! ???
2309 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2310 Loc
: constant Source_Ptr
:= Sloc
(N
);
2311 Gen_Id
: constant Node_Id
:= Name
(N
);
2314 Act_Decl_Name
: Node_Id
;
2315 Act_Decl_Id
: Entity_Id
;
2320 Gen_Unit
: Entity_Id
;
2322 Is_Actual_Pack
: constant Boolean :=
2323 Is_Internal
(Defining_Entity
(N
));
2325 Parent_Installed
: Boolean := False;
2326 Renaming_List
: List_Id
;
2327 Unit_Renaming
: Node_Id
;
2328 Needs_Body
: Boolean;
2329 Inline_Now
: Boolean := False;
2331 procedure Delay_Descriptors
(E
: Entity_Id
);
2332 -- Delay generation of subprogram descriptors for given entity
2334 function Might_Inline_Subp
return Boolean;
2335 -- If inlining is active and the generic contains inlined subprograms,
2336 -- we instantiate the body. This may cause superfluous instantiations,
2337 -- but it is simpler than detecting the need for the body at the point
2338 -- of inlining, when the context of the instance is not available.
2340 -----------------------
2341 -- Delay_Descriptors --
2342 -----------------------
2344 procedure Delay_Descriptors
(E
: Entity_Id
) is
2346 if not Delay_Subprogram_Descriptors
(E
) then
2347 Set_Delay_Subprogram_Descriptors
(E
);
2348 Pending_Descriptor
.Increment_Last
;
2349 Pending_Descriptor
.Table
(Pending_Descriptor
.Last
) := E
;
2351 end Delay_Descriptors
;
2353 -----------------------
2354 -- Might_Inline_Subp --
2355 -----------------------
2357 function Might_Inline_Subp
return Boolean is
2361 if not Inline_Processing_Required
then
2365 E
:= First_Entity
(Gen_Unit
);
2366 while Present
(E
) loop
2367 if Is_Subprogram
(E
)
2368 and then Is_Inlined
(E
)
2378 end Might_Inline_Subp
;
2380 -- Start of processing for Analyze_Package_Instantiation
2383 -- Very first thing: apply the special kludge for Text_IO processing
2384 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2386 Text_IO_Kludge
(Name
(N
));
2388 -- Make node global for error reporting.
2390 Instantiation_Node
:= N
;
2392 -- Case of instantiation of a generic package
2394 if Nkind
(N
) = N_Package_Instantiation
then
2395 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2396 Set_Comes_From_Source
(Act_Decl_Id
, True);
2398 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2400 Make_Defining_Program_Unit_Name
(Loc
,
2401 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2402 Defining_Identifier
=> Act_Decl_Id
);
2404 Act_Decl_Name
:= Act_Decl_Id
;
2407 -- Case of instantiation of a formal package
2410 Act_Decl_Id
:= Defining_Identifier
(N
);
2411 Act_Decl_Name
:= Act_Decl_Id
;
2414 Generate_Definition
(Act_Decl_Id
);
2415 Pre_Analyze_Actuals
(N
);
2418 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2419 Gen_Unit
:= Entity
(Gen_Id
);
2421 -- Verify that it is the name of a generic package
2423 if Etype
(Gen_Unit
) = Any_Type
then
2427 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2429 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2431 if From_With_Type
(Gen_Unit
) then
2433 ("cannot instantiate a limited withed package", Gen_Id
);
2436 ("expect name of generic package in instantiation", Gen_Id
);
2443 if In_Extended_Main_Source_Unit
(N
) then
2444 Set_Is_Instantiated
(Gen_Unit
);
2445 Generate_Reference
(Gen_Unit
, N
);
2447 if Present
(Renamed_Object
(Gen_Unit
)) then
2448 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2449 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2453 if Nkind
(Gen_Id
) = N_Identifier
2454 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2457 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2459 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2460 and then Is_Child_Unit
(Gen_Unit
)
2461 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2462 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2465 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2468 Set_Entity
(Gen_Id
, Gen_Unit
);
2470 -- If generic is a renaming, get original generic unit.
2472 if Present
(Renamed_Object
(Gen_Unit
))
2473 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2475 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2478 -- Verify that there are no circular instantiations.
2480 if In_Open_Scopes
(Gen_Unit
) then
2481 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2485 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2486 Error_Msg_Node_2
:= Current_Scope
;
2488 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2489 Circularity_Detected
:= True;
2494 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
2495 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2497 -- Initialize renamings map, for error checking, and the list
2498 -- that holds private entities whose views have changed between
2499 -- generic definition and instantiation. If this is the instance
2500 -- created to validate an actual package, the instantiation
2501 -- environment is that of the enclosing instance.
2503 Generic_Renamings
.Set_Last
(0);
2504 Generic_Renamings_HTable
.Reset
;
2506 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2508 -- Copy original generic tree, to produce text for instantiation.
2512 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
2514 Act_Spec
:= Specification
(Act_Tree
);
2516 -- If this is the instance created to validate an actual package,
2517 -- only the formals matter, do not examine the package spec itself.
2519 if Is_Actual_Pack
then
2520 Set_Visible_Declarations
(Act_Spec
, New_List
);
2521 Set_Private_Declarations
(Act_Spec
, New_List
);
2525 Analyze_Associations
2527 Generic_Formal_Declarations
(Act_Tree
),
2528 Generic_Formal_Declarations
(Gen_Decl
));
2530 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
2531 Set_Is_Generic_Instance
(Act_Decl_Id
);
2533 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
2535 -- References to the generic in its own declaration or its body
2536 -- are references to the instance. Add a renaming declaration for
2537 -- the generic unit itself. This declaration, as well as the renaming
2538 -- declarations for the generic formals, must remain private to the
2539 -- unit: the formals, because this is the language semantics, and
2540 -- the unit because its use is an artifact of the implementation.
2543 Make_Package_Renaming_Declaration
(Loc
,
2544 Defining_Unit_Name
=>
2545 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2546 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
2548 Append
(Unit_Renaming
, Renaming_List
);
2550 -- The renaming declarations are the first local declarations of
2553 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
2555 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
2557 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
2561 Make_Package_Declaration
(Loc
,
2562 Specification
=> Act_Spec
);
2564 -- Save the instantiation node, for subsequent instantiation
2565 -- of the body, if there is one and we are generating code for
2566 -- the current unit. Mark the unit as having a body, to avoid
2567 -- a premature error message.
2569 -- We instantiate the body if we are generating code, if we are
2570 -- generating cross-reference information, or if we are building
2571 -- trees for ASIS use.
2574 Enclosing_Body_Present
: Boolean := False;
2575 -- If the generic unit is not a compilation unit, then a body
2576 -- may be present in its parent even if none is required. We
2577 -- create a tentative pending instantiation for the body, which
2578 -- will be discarded if none is actually present.
2583 if Scope
(Gen_Unit
) /= Standard_Standard
2584 and then not Is_Child_Unit
(Gen_Unit
)
2586 Scop
:= Scope
(Gen_Unit
);
2588 while Present
(Scop
)
2589 and then Scop
/= Standard_Standard
2591 if Unit_Requires_Body
(Scop
) then
2592 Enclosing_Body_Present
:= True;
2595 elsif In_Open_Scopes
(Scop
)
2596 and then In_Package_Body
(Scop
)
2598 Enclosing_Body_Present
:= True;
2602 exit when Is_Compilation_Unit
(Scop
);
2603 Scop
:= Scope
(Scop
);
2607 -- If front-end inlining is enabled, and this is a unit for which
2608 -- code will be generated, we instantiate the body at once.
2609 -- This is done if the instance is not the main unit, and if the
2610 -- generic is not a child unit of another generic, to avoid scope
2611 -- problems and the reinstallation of parent instances.
2613 if Front_End_Inlining
2614 and then Expander_Active
2615 and then (not Is_Child_Unit
(Gen_Unit
)
2616 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
2617 and then (Is_In_Main_Unit
(N
)
2618 or else In_Main_Context
(Current_Scope
))
2619 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2620 and then Might_Inline_Subp
2621 and then not Is_Actual_Pack
2627 (Unit_Requires_Body
(Gen_Unit
)
2628 or else Enclosing_Body_Present
2629 or else Present
(Corresponding_Body
(Gen_Decl
)))
2630 and then (Is_In_Main_Unit
(N
)
2631 or else Might_Inline_Subp
)
2632 and then not Is_Actual_Pack
2633 and then not Inline_Now
2635 and then (Operating_Mode
= Generate_Code
2636 or else (Operating_Mode
= Check_Semantics
2637 and then ASIS_Mode
));
2639 -- If front_end_inlining is enabled, do not instantiate a
2640 -- body if within a generic context.
2642 if (Front_End_Inlining
2643 and then not Expander_Active
)
2644 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
2646 Needs_Body
:= False;
2649 -- If the current context is generic, and the package being
2650 -- instantiated is declared within a formal package, there
2651 -- is no body to instantiate until the enclosing generic is
2652 -- instantiated, and there is an actual for the formal
2653 -- package. If the formal package has parameters, we build a
2654 -- regular package instance for it, that preceeds the original
2655 -- formal package declaration.
2657 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
2659 Decl
: constant Node_Id
:=
2661 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
2663 if Nkind
(Decl
) = N_Formal_Package_Declaration
2664 or else (Nkind
(Decl
) = N_Package_Declaration
2665 and then Is_List_Member
(Decl
)
2666 and then Present
(Next
(Decl
))
2668 Nkind
(Next
(Decl
)) = N_Formal_Package_Declaration
)
2670 Needs_Body
:= False;
2676 -- If we are generating the calling stubs from the instantiation
2677 -- of a generic RCI package, we will not use the body of the
2680 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
2681 and then Is_Compilation_Unit
(Defining_Entity
(N
))
2683 Needs_Body
:= False;
2688 -- Here is a defence against a ludicrous number of instantiations
2689 -- caused by a circular set of instantiation attempts.
2691 if Pending_Instantiations
.Last
>
2692 Hostparm
.Max_Instantiations
2694 Error_Msg_N
("too many instantiations", N
);
2695 raise Unrecoverable_Error
;
2698 -- Indicate that the enclosing scopes contain an instantiation,
2699 -- and that cleanup actions should be delayed until after the
2700 -- instance body is expanded.
2702 Check_Forward_Instantiation
(Gen_Decl
);
2703 if Nkind
(N
) = N_Package_Instantiation
then
2705 Enclosing_Master
: Entity_Id
:= Current_Scope
;
2708 while Enclosing_Master
/= Standard_Standard
loop
2710 if Ekind
(Enclosing_Master
) = E_Package
then
2711 if Is_Compilation_Unit
(Enclosing_Master
) then
2712 if In_Package_Body
(Enclosing_Master
) then
2714 (Body_Entity
(Enclosing_Master
));
2723 Enclosing_Master
:= Scope
(Enclosing_Master
);
2726 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
2727 Enclosing_Master
:= Scope
(Enclosing_Master
);
2729 elsif Is_Generic_Subprogram
(Enclosing_Master
)
2730 or else Ekind
(Enclosing_Master
) = E_Void
2732 -- Cleanup actions will eventually be performed on
2733 -- the enclosing instance, if any. enclosing scope
2734 -- is void in the formal part of a generic subp.
2739 if Ekind
(Enclosing_Master
) = E_Entry
2741 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
2744 Protected_Body_Subprogram
(Enclosing_Master
);
2747 Set_Delay_Cleanups
(Enclosing_Master
);
2749 while Ekind
(Enclosing_Master
) = E_Block
loop
2750 Enclosing_Master
:= Scope
(Enclosing_Master
);
2753 if Is_Subprogram
(Enclosing_Master
) then
2754 Delay_Descriptors
(Enclosing_Master
);
2756 elsif Is_Task_Type
(Enclosing_Master
) then
2758 TBP
: constant Node_Id
:=
2759 Get_Task_Body_Procedure
2763 if Present
(TBP
) then
2764 Delay_Descriptors
(TBP
);
2765 Set_Delay_Cleanups
(TBP
);
2775 -- Make entry in table
2777 Pending_Instantiations
.Increment_Last
;
2778 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
2779 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
2783 Set_Categorization_From_Pragmas
(Act_Decl
);
2785 if Parent_Installed
then
2789 Set_Instance_Spec
(N
, Act_Decl
);
2791 -- If not a compilation unit, insert the package declaration
2792 -- before the original instantiation node.
2794 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2795 Mark_Rewrite_Insertion
(Act_Decl
);
2796 Insert_Before
(N
, Act_Decl
);
2799 -- For an instantiation that is a compilation unit, place
2800 -- declaration on current node so context is complete
2801 -- for analysis (including nested instantiations). It this
2802 -- is the main unit, the declaration eventually replaces the
2803 -- instantiation node. If the instance body is later created, it
2804 -- replaces the instance node, and the declation is attached to
2805 -- it (see Build_Instance_Compilation_Unit_Nodes).
2808 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
2810 -- The entity for the current unit is the newly created one,
2811 -- and all semantic information is attached to it.
2813 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
2815 -- If this is the main unit, replace the main entity as well.
2817 if Current_Sem_Unit
= Main_Unit
then
2818 Main_Unit_Entity
:= Act_Decl_Id
;
2822 Set_Unit
(Parent
(N
), Act_Decl
);
2823 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
2825 Set_Unit
(Parent
(N
), N
);
2826 Set_Body_Required
(Parent
(N
), False);
2828 -- We never need elaboration checks on instantiations, since
2829 -- by definition, the body instantiation is elaborated at the
2830 -- same time as the spec instantiation.
2832 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
2833 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
2836 Check_Elab_Instantiation
(N
);
2838 if ABE_Is_Certain
(N
) and then Needs_Body
then
2839 Pending_Instantiations
.Decrement_Last
;
2841 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
2843 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
2844 First_Private_Entity
(Act_Decl_Id
));
2846 -- If the instantiation will receive a body, the unit will
2847 -- be transformed into a package body, and receive its own
2848 -- elaboration entity. Otherwise, the nature of the unit is
2849 -- now a package declaration.
2851 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2852 and then not Needs_Body
2854 Rewrite
(N
, Act_Decl
);
2857 if Present
(Corresponding_Body
(Gen_Decl
))
2858 or else Unit_Requires_Body
(Gen_Unit
)
2860 Set_Has_Completion
(Act_Decl_Id
);
2863 Check_Formal_Packages
(Act_Decl_Id
);
2865 Restore_Private_Views
(Act_Decl_Id
);
2867 if not Generic_Separately_Compiled
(Gen_Unit
) then
2868 Inherit_Context
(Gen_Decl
, N
);
2871 if Parent_Installed
then
2878 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
2880 -- Check restriction, but skip this if something went wrong in
2881 -- the above analysis, indicated by Act_Decl_Id being void.
2883 if Ekind
(Act_Decl_Id
) /= E_Void
2884 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
2886 Check_Restriction
(No_Local_Allocators
, N
);
2890 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
2893 -- The following is a tree patch for ASIS: ASIS needs separate nodes
2894 -- to be used as defining identifiers for a formal package and for the
2895 -- corresponding expanded package
2897 if Nkind
(N
) = N_Formal_Package_Declaration
then
2898 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2899 Set_Comes_From_Source
(Act_Decl_Id
, True);
2900 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
2901 Set_Defining_Identifier
(N
, Act_Decl_Id
);
2905 when Instantiation_Error
=>
2906 if Parent_Installed
then
2909 end Analyze_Package_Instantiation
;
2911 --------------------------
2912 -- Inline_Instance_Body --
2913 --------------------------
2915 procedure Inline_Instance_Body
2917 Gen_Unit
: Entity_Id
;
2921 Gen_Comp
: constant Entity_Id
:=
2922 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
2923 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
2924 Curr_Scope
: Entity_Id
:= Empty
;
2925 Curr_Unit
: constant Entity_Id
:=
2926 Cunit_Entity
(Current_Sem_Unit
);
2927 Removed
: Boolean := False;
2928 Num_Scopes
: Int
:= 0;
2929 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2930 Instances
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2931 Inner_Scopes
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2932 Num_Inner
: Int
:= 0;
2933 N_Instances
: Int
:= 0;
2937 -- Case of generic unit defined in another unit. We must remove
2938 -- the complete context of the current unit to install that of
2941 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
2945 and then S
/= Standard_Standard
2947 Num_Scopes
:= Num_Scopes
+ 1;
2949 Use_Clauses
(Num_Scopes
) :=
2951 (Scope_Stack
.Last
- Num_Scopes
+ 1).
2953 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
2955 exit when Is_Generic_Instance
(S
)
2956 and then (In_Package_Body
(S
)
2957 or else Ekind
(S
) = E_Procedure
2958 or else Ekind
(S
) = E_Function
);
2962 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
2964 -- Find and save all enclosing instances
2969 and then S
/= Standard_Standard
2971 if Is_Generic_Instance
(S
) then
2972 N_Instances
:= N_Instances
+ 1;
2973 Instances
(N_Instances
) := S
;
2975 exit when In_Package_Body
(S
);
2981 -- Remove context of current compilation unit, unless we
2982 -- are within a nested package instantiation, in which case
2983 -- the context has been removed previously.
2985 -- If current scope is the body of a child unit, remove context
2991 and then S
/= Standard_Standard
2993 exit when Is_Generic_Instance
(S
)
2994 and then (In_Package_Body
(S
)
2995 or else Ekind
(S
) = E_Procedure
2996 or else Ekind
(S
) = E_Function
);
2999 or else (Ekind
(Curr_Unit
) = E_Package_Body
3000 and then S
= Spec_Entity
(Curr_Unit
))
3001 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3004 (Unit_Declaration_Node
(Curr_Unit
)))
3008 -- Remove entities in current scopes from visibility, so
3009 -- than instance body is compiled in a clean environment.
3011 Save_Scope_Stack
(Handle_Use
=> False);
3013 if Is_Child_Unit
(S
) then
3015 -- Remove child unit from stack, as well as inner scopes.
3016 -- Removing the context of a child unit removes parent
3019 while Current_Scope
/= S
loop
3020 Num_Inner
:= Num_Inner
+ 1;
3021 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3026 Remove_Context
(Curr_Comp
);
3030 Remove_Context
(Curr_Comp
);
3033 if Ekind
(Curr_Unit
) = E_Package_Body
then
3034 Remove_Context
(Library_Unit
(Curr_Comp
));
3041 New_Scope
(Standard_Standard
);
3042 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3043 Instantiate_Package_Body
3044 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3049 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3051 -- Reset Generic_Instance flag so that use clauses can be installed
3052 -- in the proper order. (See Use_One_Package for effect of enclosing
3053 -- instances on processing of use clauses).
3055 for J
in 1 .. N_Instances
loop
3056 Set_Is_Generic_Instance
(Instances
(J
), False);
3060 Install_Context
(Curr_Comp
);
3062 if Present
(Curr_Scope
)
3063 and then Is_Child_Unit
(Curr_Scope
)
3065 New_Scope
(Curr_Scope
);
3066 Set_Is_Immediately_Visible
(Curr_Scope
);
3068 -- Finally, restore inner scopes as well.
3070 for J
in reverse 1 .. Num_Inner
loop
3071 New_Scope
(Inner_Scopes
(J
));
3075 Restore_Scope_Stack
(Handle_Use
=> False);
3078 -- Restore use clauses. For a child unit, use clauses in the
3079 -- parents are restored when installing the context, so only
3080 -- those in inner scopes (and those local to the child unit itself)
3081 -- need to be installed explicitly.
3083 if Is_Child_Unit
(Curr_Unit
)
3086 for J
in reverse 1 .. Num_Inner
+ 1 loop
3087 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3089 Install_Use_Clauses
(Use_Clauses
(J
));
3093 for J
in reverse 1 .. Num_Scopes
loop
3094 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3096 Install_Use_Clauses
(Use_Clauses
(J
));
3100 for J
in 1 .. N_Instances
loop
3101 Set_Is_Generic_Instance
(Instances
(J
), True);
3104 -- If generic unit is in current unit, current context is correct.
3107 Instantiate_Package_Body
3108 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3110 end Inline_Instance_Body
;
3112 -------------------------------------
3113 -- Analyze_Procedure_Instantiation --
3114 -------------------------------------
3116 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3118 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3119 end Analyze_Procedure_Instantiation
;
3121 --------------------------------------
3122 -- Analyze_Subprogram_Instantiation --
3123 --------------------------------------
3125 procedure Analyze_Subprogram_Instantiation
3129 Loc
: constant Source_Ptr
:= Sloc
(N
);
3130 Gen_Id
: constant Node_Id
:= Name
(N
);
3132 Anon_Id
: constant Entity_Id
:=
3133 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3134 Chars
=> New_External_Name
3135 (Chars
(Defining_Entity
(N
)), 'R'));
3137 Act_Decl_Id
: Entity_Id
;
3142 Gen_Unit
: Entity_Id
;
3144 Pack_Id
: Entity_Id
;
3145 Parent_Installed
: Boolean := False;
3146 Renaming_List
: List_Id
;
3148 procedure Analyze_Instance_And_Renamings
;
3149 -- The instance must be analyzed in a context that includes the
3150 -- mappings of generic parameters into actuals. We create a package
3151 -- declaration for this purpose, and a subprogram with an internal
3152 -- name within the package. The subprogram instance is simply an
3153 -- alias for the internal subprogram, declared in the current scope.
3155 ------------------------------------
3156 -- Analyze_Instance_And_Renamings --
3157 ------------------------------------
3159 procedure Analyze_Instance_And_Renamings
is
3160 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3161 Pack_Decl
: Node_Id
;
3164 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3166 -- For the case of a compilation unit, the container package
3167 -- has the same name as the instantiation, to insure that the
3168 -- binder calls the elaboration procedure with the right name.
3169 -- Copy the entity of the instance, which may have compilation
3170 -- level flags (e.g. Is_Child_Unit) set.
3172 Pack_Id
:= New_Copy
(Def_Ent
);
3175 -- Otherwise we use the name of the instantiation concatenated
3176 -- with its source position to ensure uniqueness if there are
3177 -- several instantiations with the same name.
3180 Make_Defining_Identifier
(Loc
,
3181 Chars
=> New_External_Name
3182 (Related_Id
=> Chars
(Def_Ent
),
3184 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3187 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3188 Specification
=> Make_Package_Specification
(Loc
,
3189 Defining_Unit_Name
=> Pack_Id
,
3190 Visible_Declarations
=> Renaming_List
,
3191 End_Label
=> Empty
));
3193 Set_Instance_Spec
(N
, Pack_Decl
);
3194 Set_Is_Generic_Instance
(Pack_Id
);
3195 Set_Needs_Debug_Info
(Pack_Id
);
3197 -- Case of not a compilation unit
3199 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3200 Mark_Rewrite_Insertion
(Pack_Decl
);
3201 Insert_Before
(N
, Pack_Decl
);
3202 Set_Has_Completion
(Pack_Id
);
3204 -- Case of an instantiation that is a compilation unit
3206 -- Place declaration on current node so context is complete
3207 -- for analysis (including nested instantiations), and for
3208 -- use in a context_clause (see Analyze_With_Clause).
3211 Set_Unit
(Parent
(N
), Pack_Decl
);
3212 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3215 Analyze
(Pack_Decl
);
3216 Check_Formal_Packages
(Pack_Id
);
3217 Set_Is_Generic_Instance
(Pack_Id
, False);
3219 -- Body of the enclosing package is supplied when instantiating
3220 -- the subprogram body, after semantic analysis is completed.
3222 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3224 -- Remove package itself from visibility, so it does not
3225 -- conflict with subprogram.
3227 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3229 -- Set name and scope of internal subprogram so that the
3230 -- proper external name will be generated. The proper scope
3231 -- is the scope of the wrapper package. We need to generate
3232 -- debugging information for the internal subprogram, so set
3233 -- flag accordingly.
3235 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3236 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3238 -- Mark wrapper package as referenced, to avoid spurious
3239 -- warnings if the instantiation appears in various with_
3240 -- clauses of subunits of the main unit.
3242 Set_Referenced
(Pack_Id
);
3245 Set_Is_Generic_Instance
(Anon_Id
);
3246 Set_Needs_Debug_Info
(Anon_Id
);
3247 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3249 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3250 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3251 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3252 Set_Comes_From_Source
(Act_Decl_Id
, True);
3254 -- The signature may involve types that are not frozen yet, but
3255 -- the subprogram will be frozen at the point the wrapper package
3256 -- is frozen, so it does not need its own freeze node. In fact, if
3257 -- one is created, it might conflict with the freezing actions from
3258 -- the wrapper package (see 7206-013).
3260 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3262 -- If the instance is a child unit, mark the Id accordingly. Mark
3263 -- the anonymous entity as well, which is the real subprogram and
3264 -- which is used when the instance appears in a context clause.
3266 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3267 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3268 New_Overloaded_Entity
(Act_Decl_Id
);
3269 Check_Eliminated
(Act_Decl_Id
);
3271 -- In compilation unit case, kill elaboration checks on the
3272 -- instantiation, since they are never needed -- the body is
3273 -- instantiated at the same point as the spec.
3275 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3276 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3277 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3278 Set_Is_Compilation_Unit
(Anon_Id
);
3280 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3283 -- The instance is not a freezing point for the new subprogram.
3285 Set_Is_Frozen
(Act_Decl_Id
, False);
3287 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3288 Valid_Operator_Definition
(Act_Decl_Id
);
3291 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3292 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3293 Set_Has_Completion
(Act_Decl_Id
);
3294 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3296 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3297 Set_Body_Required
(Parent
(N
), False);
3300 end Analyze_Instance_And_Renamings
;
3302 -- Start of processing for Analyze_Subprogram_Instantiation
3305 -- Very first thing: apply the special kludge for Text_IO processing
3306 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3307 -- Of course such an instantiation is bogus (these are packages, not
3308 -- subprograms), but we get a better error message if we do this.
3310 Text_IO_Kludge
(Gen_Id
);
3312 -- Make node global for error reporting.
3314 Instantiation_Node
:= N
;
3315 Pre_Analyze_Actuals
(N
);
3318 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3319 Gen_Unit
:= Entity
(Gen_Id
);
3321 Generate_Reference
(Gen_Unit
, Gen_Id
);
3323 if Nkind
(Gen_Id
) = N_Identifier
3324 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3327 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3330 if Etype
(Gen_Unit
) = Any_Type
then
3335 -- Verify that it is a generic subprogram of the right kind, and that
3336 -- it does not lead to a circular instantiation.
3338 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3339 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3341 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3343 elsif In_Open_Scopes
(Gen_Unit
) then
3344 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3346 elsif K
= E_Procedure
3347 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3349 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3351 ("cannot instantiate generic function as procedure", Gen_Id
);
3354 ("expect name of generic procedure in instantiation", Gen_Id
);
3357 elsif K
= E_Function
3358 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3360 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3362 ("cannot instantiate generic procedure as function", Gen_Id
);
3365 ("expect name of generic function in instantiation", Gen_Id
);
3369 Set_Entity
(Gen_Id
, Gen_Unit
);
3370 Set_Is_Instantiated
(Gen_Unit
);
3372 if In_Extended_Main_Source_Unit
(N
) then
3373 Generate_Reference
(Gen_Unit
, N
);
3376 -- If renaming, get original unit
3378 if Present
(Renamed_Object
(Gen_Unit
))
3379 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
3381 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
3383 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3384 Set_Is_Instantiated
(Gen_Unit
);
3385 Generate_Reference
(Gen_Unit
, N
);
3388 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3389 Error_Msg_Node_2
:= Current_Scope
;
3391 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3392 Circularity_Detected
:= True;
3396 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3398 -- The subprogram itself cannot contain a nested instance, so
3399 -- the current parent is left empty.
3401 Set_Instance_Env
(Gen_Unit
, Empty
);
3403 -- Initialize renamings map, for error checking.
3405 Generic_Renamings
.Set_Last
(0);
3406 Generic_Renamings_HTable
.Reset
;
3408 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3410 -- Copy original generic tree, to produce text for instantiation.
3414 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3416 Act_Spec
:= Specification
(Act_Tree
);
3418 Analyze_Associations
3420 Generic_Formal_Declarations
(Act_Tree
),
3421 Generic_Formal_Declarations
(Gen_Decl
));
3423 -- Build the subprogram declaration, which does not appear
3424 -- in the generic template, and give it a sloc consistent
3425 -- with that of the template.
3427 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
3428 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3430 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
3431 Specification
=> Act_Spec
);
3433 Set_Categorization_From_Pragmas
(Act_Decl
);
3435 if Parent_Installed
then
3439 Append
(Act_Decl
, Renaming_List
);
3440 Analyze_Instance_And_Renamings
;
3442 -- If the generic is marked Import (Intrinsic), then so is the
3443 -- instance. This indicates that there is no body to instantiate.
3444 -- If generic is marked inline, so it the instance, and the
3445 -- anonymous subprogram it renames. If inlined, or else if inlining
3446 -- is enabled for the compilation, we generate the instance body
3447 -- even if it is not within the main unit.
3449 -- Any other pragmas might also be inherited ???
3451 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
3452 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
3453 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
3455 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
3456 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
3460 Generate_Definition
(Act_Decl_Id
);
3462 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
3463 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
3465 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
3466 Check_Elab_Instantiation
(N
);
3469 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3471 -- Subject to change, pending on if other pragmas are inherited ???
3473 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3475 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
3477 if not Generic_Separately_Compiled
(Gen_Unit
) then
3478 Inherit_Context
(Gen_Decl
, N
);
3481 Restore_Private_Views
(Pack_Id
, False);
3483 -- If the context requires a full instantiation, mark node for
3484 -- subsequent construction of the body.
3486 if (Is_In_Main_Unit
(N
)
3487 or else Is_Inlined
(Act_Decl_Id
))
3488 and then (Operating_Mode
= Generate_Code
3489 or else (Operating_Mode
= Check_Semantics
3490 and then ASIS_Mode
))
3491 and then (Expander_Active
or else ASIS_Mode
)
3492 and then not ABE_Is_Certain
(N
)
3493 and then not Is_Eliminated
(Act_Decl_Id
)
3495 Pending_Instantiations
.Increment_Last
;
3496 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
3497 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
3498 Check_Forward_Instantiation
(Gen_Decl
);
3500 -- The wrapper package is always delayed, because it does
3501 -- not constitute a freeze point, but to insure that the
3502 -- freeze node is placed properly, it is created directly
3503 -- when instantiating the body (otherwise the freeze node
3504 -- might appear to early for nested instantiations).
3506 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3508 -- For ASIS purposes, indicate that the wrapper package has
3509 -- replaced the instantiation node.
3511 Rewrite
(N
, Unit
(Parent
(N
)));
3512 Set_Unit
(Parent
(N
), N
);
3515 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3517 -- Replace instance node for library-level instantiations
3518 -- of intrinsic subprograms, for ASIS use.
3520 Rewrite
(N
, Unit
(Parent
(N
)));
3521 Set_Unit
(Parent
(N
), N
);
3524 if Parent_Installed
then
3529 Generic_Renamings
.Set_Last
(0);
3530 Generic_Renamings_HTable
.Reset
;
3534 when Instantiation_Error
=>
3535 if Parent_Installed
then
3538 end Analyze_Subprogram_Instantiation
;
3540 -------------------------
3541 -- Get_Associated_Node --
3542 -------------------------
3544 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
3545 Assoc
: Node_Id
:= Associated_Node
(N
);
3548 if Nkind
(Assoc
) /= Nkind
(N
) then
3551 elsif Nkind
(Assoc
) = N_Aggregate
3552 or else Nkind
(Assoc
) = N_Extension_Aggregate
3557 -- If the node is part of an inner generic, it may itself have been
3558 -- remapped into a further generic copy. Associated_Node is otherwise
3559 -- used for the entity of the node, and will be of a different node
3560 -- kind, or else N has been rewritten as a literal or function call.
3562 while Present
(Associated_Node
(Assoc
))
3563 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
3565 Assoc
:= Associated_Node
(Assoc
);
3568 -- Follow and additional link in case the final node was rewritten.
3569 -- This can only happen with nested generic units.
3571 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
3572 and then Present
(Associated_Node
(Assoc
))
3573 and then (Nkind
(Associated_Node
(Assoc
)) = N_Function_Call
3575 Nkind
(Associated_Node
(Assoc
)) = N_Explicit_Dereference
3577 Nkind
(Associated_Node
(Assoc
)) = N_Integer_Literal
3579 Nkind
(Associated_Node
(Assoc
)) = N_Real_Literal
3581 Nkind
(Associated_Node
(Assoc
)) = N_String_Literal
)
3583 Assoc
:= Associated_Node
(Assoc
);
3588 end Get_Associated_Node
;
3590 -------------------------------------------
3591 -- Build_Instance_Compilation_Unit_Nodes --
3592 -------------------------------------------
3594 procedure Build_Instance_Compilation_Unit_Nodes
3599 Decl_Cunit
: Node_Id
;
3600 Body_Cunit
: Node_Id
;
3602 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
3603 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
3606 -- A new compilation unit node is built for the instance declaration
3609 Make_Compilation_Unit
(Sloc
(N
),
3610 Context_Items
=> Empty_List
,
3613 Make_Compilation_Unit_Aux
(Sloc
(N
)));
3615 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3616 Set_Body_Required
(Decl_Cunit
, True);
3618 -- We use the original instantiation compilation unit as the resulting
3619 -- compilation unit of the instance, since this is the main unit.
3621 Rewrite
(N
, Act_Body
);
3622 Body_Cunit
:= Parent
(N
);
3624 -- The two compilation unit nodes are linked by the Library_Unit field
3626 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
3627 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
3629 -- Preserve the private nature of the package if needed.
3631 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
3633 -- If the instance is not the main unit, its context, categorization,
3634 -- and elaboration entity are not relevant to the compilation.
3636 if Parent
(N
) /= Cunit
(Main_Unit
) then
3640 -- The context clause items on the instantiation, which are now
3641 -- attached to the body compilation unit (since the body overwrote
3642 -- the original instantiation node), semantically belong on the spec,
3643 -- so copy them there. It's harmless to leave them on the body as well.
3644 -- In fact one could argue that they belong in both places.
3646 Citem
:= First
(Context_Items
(Body_Cunit
));
3647 while Present
(Citem
) loop
3648 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
3652 -- Propagate categorization flags on packages, so that they appear
3653 -- in ali file for the spec of the unit.
3655 if Ekind
(New_Main
) = E_Package
then
3656 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
3657 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
3658 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
3659 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
3660 Set_Is_Remote_Call_Interface
3661 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
3664 -- Make entry in Units table, so that binder can generate call to
3665 -- elaboration procedure for body, if any.
3667 Make_Instance_Unit
(Body_Cunit
);
3668 Main_Unit_Entity
:= New_Main
;
3669 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
3671 -- Build elaboration entity, since the instance may certainly
3672 -- generate elaboration code requiring a flag for protection.
3674 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
3675 end Build_Instance_Compilation_Unit_Nodes
;
3677 -----------------------------------
3678 -- Check_Formal_Package_Instance --
3679 -----------------------------------
3681 -- If the formal has specific parameters, they must match those of the
3682 -- actual. Both of them are instances, and the renaming declarations
3683 -- for their formal parameters appear in the same order in both. The
3684 -- analyzed formal has been analyzed in the context of the current
3687 procedure Check_Formal_Package_Instance
3688 (Formal_Pack
: Entity_Id
;
3689 Actual_Pack
: Entity_Id
)
3691 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
3692 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
3697 procedure Check_Mismatch
(B
: Boolean);
3698 -- Common error routine for mismatch between the parameters of
3699 -- the actual instance and those of the formal package.
3701 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
3702 -- The formal may come from a nested formal package, and the actual
3703 -- may have been constant-folded. To determine whether the two denote
3704 -- the same entity we may have to traverse several definitions to
3705 -- recover the ultimate entity that they refer to.
3707 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
3708 -- Similarly, if the formal comes from a nested formal package, the
3709 -- actual may designate the formal through multiple renamings, which
3710 -- have to be followed to determine the original variable in question.
3712 --------------------
3713 -- Check_Mismatch --
3714 --------------------
3716 procedure Check_Mismatch
(B
: Boolean) is
3720 ("actual for & in actual instance does not match formal",
3721 Parent
(Actual_Pack
), E1
);
3725 --------------------------------
3726 -- Same_Instantiated_Constant --
3727 --------------------------------
3729 function Same_Instantiated_Constant
3730 (E1
, E2
: Entity_Id
) return Boolean
3735 while Present
(Ent
) loop
3739 elsif Ekind
(Ent
) /= E_Constant
then
3742 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
3743 if Entity
(Constant_Value
(Ent
)) = E1
then
3746 Ent
:= Entity
(Constant_Value
(Ent
));
3749 -- The actual may be a constant that has been folded. Recover
3752 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
3753 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
3760 end Same_Instantiated_Constant
;
3762 --------------------------------
3763 -- Same_Instantiated_Variable --
3764 --------------------------------
3766 function Same_Instantiated_Variable
3767 (E1
, E2
: Entity_Id
) return Boolean
3769 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
3770 -- Follow chain of renamings to the ultimate ancestor.
3772 ---------------------
3773 -- Original_Entity --
3774 ---------------------
3776 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
3781 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
3782 and then Present
(Renamed_Object
(Orig
))
3783 and then Is_Entity_Name
(Renamed_Object
(Orig
))
3785 Orig
:= Entity
(Renamed_Object
(Orig
));
3789 end Original_Entity
;
3791 -- Start of processing for Same_Instantiated_Variable
3794 return Ekind
(E1
) = Ekind
(E2
)
3795 and then Original_Entity
(E1
) = Original_Entity
(E2
);
3796 end Same_Instantiated_Variable
;
3798 -- Start of processing for Check_Formal_Package_Instance
3802 and then Present
(E2
)
3804 exit when Ekind
(E1
) = E_Package
3805 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
3807 if Is_Type
(E1
) then
3809 -- Subtypes must statically match. E1 and E2 are the
3810 -- local entities that are subtypes of the actuals.
3811 -- Itypes generated for other parameters need not be checked,
3812 -- the check will be performed on the parameters themselves.
3814 if not Is_Itype
(E1
)
3815 and then not Is_Itype
(E2
)
3819 or else Etype
(E1
) /= Etype
(E2
)
3820 or else not Subtypes_Statically_Match
(E1
, E2
));
3823 elsif Ekind
(E1
) = E_Constant
then
3825 -- IN parameters must denote the same static value, or
3826 -- the same constant, or the literal null.
3828 Expr1
:= Expression
(Parent
(E1
));
3830 if Ekind
(E2
) /= E_Constant
then
3831 Check_Mismatch
(True);
3834 Expr2
:= Expression
(Parent
(E2
));
3837 if Is_Static_Expression
(Expr1
) then
3839 if not Is_Static_Expression
(Expr2
) then
3840 Check_Mismatch
(True);
3842 elsif Is_Integer_Type
(Etype
(E1
)) then
3845 V1
: constant Uint
:= Expr_Value
(Expr1
);
3846 V2
: constant Uint
:= Expr_Value
(Expr2
);
3848 Check_Mismatch
(V1
/= V2
);
3851 elsif Is_Real_Type
(Etype
(E1
)) then
3853 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
3854 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
3856 Check_Mismatch
(V1
/= V2
);
3859 elsif Is_String_Type
(Etype
(E1
))
3860 and then Nkind
(Expr1
) = N_String_Literal
3863 if Nkind
(Expr2
) /= N_String_Literal
then
3864 Check_Mismatch
(True);
3867 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
3871 elsif Is_Entity_Name
(Expr1
) then
3872 if Is_Entity_Name
(Expr2
) then
3873 if Entity
(Expr1
) = Entity
(Expr2
) then
3877 (not Same_Instantiated_Constant
3878 (Entity
(Expr1
), Entity
(Expr2
)));
3881 Check_Mismatch
(True);
3884 elsif Is_Entity_Name
(Original_Node
(Expr1
))
3885 and then Is_Entity_Name
(Expr2
)
3887 Same_Instantiated_Constant
3888 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
3892 elsif Nkind
(Expr1
) = N_Null
then
3893 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
3896 Check_Mismatch
(True);
3899 elsif Ekind
(E1
) = E_Variable
then
3900 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
3902 elsif Ekind
(E1
) = E_Package
then
3904 (Ekind
(E1
) /= Ekind
(E2
)
3905 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
3907 elsif Is_Overloadable
(E1
) then
3909 -- Verify that the names of the entities match.
3910 -- What if actual is an attribute ???
3913 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
3916 raise Program_Error
;
3923 end Check_Formal_Package_Instance
;
3925 ---------------------------
3926 -- Check_Formal_Packages --
3927 ---------------------------
3929 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
3931 Formal_P
: Entity_Id
;
3934 -- Iterate through the declarations in the instance, looking for
3935 -- package renaming declarations that denote instances of formal
3936 -- packages. Stop when we find the renaming of the current package
3937 -- itself. The declaration for a formal package without a box is
3938 -- followed by an internal entity that repeats the instantiation.
3940 E
:= First_Entity
(P_Id
);
3941 while Present
(E
) loop
3942 if Ekind
(E
) = E_Package
then
3943 if Renamed_Object
(E
) = P_Id
then
3946 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
3949 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
3950 Formal_P
:= Next_Entity
(E
);
3951 Check_Formal_Package_Instance
(Formal_P
, E
);
3957 end Check_Formal_Packages
;
3959 ---------------------------------
3960 -- Check_Forward_Instantiation --
3961 ---------------------------------
3963 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
3965 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
3968 -- The instantiation appears before the generic body if we are in the
3969 -- scope of the unit containing the generic, either in its spec or in
3970 -- the package body. and before the generic body.
3972 if Ekind
(Gen_Comp
) = E_Package_Body
then
3973 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
3976 if In_Open_Scopes
(Gen_Comp
)
3977 and then No
(Corresponding_Body
(Decl
))
3982 and then not Is_Compilation_Unit
(S
)
3983 and then not Is_Child_Unit
(S
)
3985 if Ekind
(S
) = E_Package
then
3986 Set_Has_Forward_Instantiation
(S
);
3992 end Check_Forward_Instantiation
;
3994 ---------------------------
3995 -- Check_Generic_Actuals --
3996 ---------------------------
3998 -- The visibility of the actuals may be different between the
3999 -- point of generic instantiation and the instantiation of the body.
4001 procedure Check_Generic_Actuals
4002 (Instance
: Entity_Id
;
4003 Is_Formal_Box
: Boolean)
4008 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4009 -- For a formal that is an array type, the component type is often
4010 -- a previous formal in the same unit. The privacy status of the
4011 -- component type will have been examined earlier in the traversal
4012 -- of the corresponding actuals, and this status should not be
4013 -- modified for the array type itself.
4014 -- To detect this case we have to rescan the list of formals, which
4015 -- is usually short enough to ignore the resulting inefficiency.
4017 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4020 Prev
:= First_Entity
(Instance
);
4021 while Present
(Prev
) loop
4023 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4024 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4025 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4035 end Denotes_Previous_Actual
;
4037 -- Start of processing for Check_Generic_Actuals
4040 E
:= First_Entity
(Instance
);
4041 while Present
(E
) loop
4043 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4044 and then Scope
(Etype
(E
)) /= Instance
4045 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4047 if Is_Array_Type
(E
)
4048 and then Denotes_Previous_Actual
(Component_Type
(E
))
4052 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4054 Set_Is_Generic_Actual_Type
(E
, True);
4055 Set_Is_Hidden
(E
, False);
4056 Set_Is_Potentially_Use_Visible
(E
,
4059 -- We constructed the generic actual type as a subtype of
4060 -- the supplied type. This means that it normally would not
4061 -- inherit subtype specific attributes of the actual, which
4062 -- is wrong for the generic case.
4064 Astype
:= Ancestor_Subtype
(E
);
4068 -- can happen when E is an itype that is the full view of
4069 -- a private type completed, e.g. with a constrained array.
4071 Astype
:= Base_Type
(E
);
4074 Set_Size_Info
(E
, (Astype
));
4075 Set_RM_Size
(E
, RM_Size
(Astype
));
4076 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4078 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4079 Set_RM_Size
(E
, RM_Size
(Astype
));
4081 -- In nested instances, the base type of an access actual
4082 -- may itself be private, and need to be exchanged.
4084 elsif Is_Access_Type
(E
)
4085 and then Is_Private_Type
(Etype
(E
))
4088 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4091 elsif Ekind
(E
) = E_Package
then
4093 -- If this is the renaming for the current instance, we're done.
4094 -- Otherwise it is a formal package. If the corresponding formal
4095 -- was declared with a box, the (instantiations of the) generic
4096 -- formal part are also visible. Otherwise, ignore the entity
4097 -- created to validate the actuals.
4099 if Renamed_Object
(E
) = Instance
then
4102 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4105 -- The visibility of a formal of an enclosing generic is already
4108 elsif Denotes_Formal_Package
(E
) then
4111 elsif Present
(Associated_Formal_Package
(E
)) then
4112 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4113 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4116 Set_Is_Hidden
(E
, False);
4119 -- If this is a subprogram instance (in a wrapper package) the
4120 -- actual is fully visible.
4122 elsif Is_Wrapper_Package
(Instance
) then
4123 Set_Is_Hidden
(E
, False);
4126 Set_Is_Hidden
(E
, not Is_Formal_Box
);
4131 end Check_Generic_Actuals
;
4133 ------------------------------
4134 -- Check_Generic_Child_Unit --
4135 ------------------------------
4137 procedure Check_Generic_Child_Unit
4139 Parent_Installed
: in out Boolean)
4141 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4142 Gen_Par
: Entity_Id
:= Empty
;
4143 Inst_Par
: Entity_Id
;
4147 function Find_Generic_Child
4149 Id
: Node_Id
) return Entity_Id
;
4150 -- Search generic parent for possible child unit with the given name.
4152 function In_Enclosing_Instance
return Boolean;
4153 -- Within an instance of the parent, the child unit may be denoted
4154 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4155 -- scopes to locate a possible parent instantiation.
4157 ------------------------
4158 -- Find_Generic_Child --
4159 ------------------------
4161 function Find_Generic_Child
4163 Id
: Node_Id
) return Entity_Id
4168 -- If entity of name is already set, instance has already been
4169 -- resolved, e.g. in an enclosing instantiation.
4171 if Present
(Entity
(Id
)) then
4172 if Scope
(Entity
(Id
)) = Scop
then
4179 E
:= First_Entity
(Scop
);
4180 while Present
(E
) loop
4181 if Chars
(E
) = Chars
(Id
)
4182 and then Is_Child_Unit
(E
)
4184 if Is_Child_Unit
(E
)
4185 and then not Is_Visible_Child_Unit
(E
)
4188 ("generic child unit& is not visible", Gen_Id
, E
);
4200 end Find_Generic_Child
;
4202 ---------------------------
4203 -- In_Enclosing_Instance --
4204 ---------------------------
4206 function In_Enclosing_Instance
return Boolean is
4207 Enclosing_Instance
: Node_Id
;
4208 Instance_Decl
: Node_Id
;
4211 Enclosing_Instance
:= Current_Scope
;
4213 while Present
(Enclosing_Instance
) loop
4214 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4216 if Ekind
(Enclosing_Instance
) = E_Package
4217 and then Is_Generic_Instance
(Enclosing_Instance
)
4219 (Generic_Parent
(Specification
(Instance_Decl
)))
4221 -- Check whether the generic we are looking for is a child
4222 -- of this instance.
4224 E
:= Find_Generic_Child
4225 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4226 exit when Present
(E
);
4232 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
4244 Make_Expanded_Name
(Loc
,
4246 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
4247 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
4249 Set_Entity
(Gen_Id
, E
);
4250 Set_Etype
(Gen_Id
, Etype
(E
));
4251 Parent_Installed
:= False; -- Already in scope.
4254 end In_Enclosing_Instance
;
4256 -- Start of processing for Check_Generic_Child_Unit
4259 -- If the name of the generic is given by a selected component, it
4260 -- may be the name of a generic child unit, and the prefix is the name
4261 -- of an instance of the parent, in which case the child unit must be
4262 -- visible. If this instance is not in scope, it must be placed there
4263 -- and removed after instantiation, because what is being instantiated
4264 -- is not the original child, but the corresponding child present in
4265 -- the instance of the parent.
4267 -- If the child is instantiated within the parent, it can be given by
4268 -- a simple name. In this case the instance is already in scope, but
4269 -- the child generic must be recovered from the generic parent as well.
4271 if Nkind
(Gen_Id
) = N_Selected_Component
then
4272 S
:= Selector_Name
(Gen_Id
);
4273 Analyze
(Prefix
(Gen_Id
));
4274 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4276 if Ekind
(Inst_Par
) = E_Package
4277 and then Present
(Renamed_Object
(Inst_Par
))
4279 Inst_Par
:= Renamed_Object
(Inst_Par
);
4282 if Ekind
(Inst_Par
) = E_Package
then
4283 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
4284 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
4286 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
4288 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
4290 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
4293 elsif Ekind
(Inst_Par
) = E_Generic_Package
4294 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
4296 -- A formal package may be a real child package, and not the
4297 -- implicit instance within a parent. In this case the child is
4298 -- not visible and has to be retrieved explicitly as well.
4300 Gen_Par
:= Inst_Par
;
4303 if Present
(Gen_Par
) then
4305 -- The prefix denotes an instantiation. The entity itself
4306 -- may be a nested generic, or a child unit.
4308 E
:= Find_Generic_Child
(Gen_Par
, S
);
4311 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
4312 Set_Entity
(Gen_Id
, E
);
4313 Set_Etype
(Gen_Id
, Etype
(E
));
4315 Set_Etype
(S
, Etype
(E
));
4317 -- Indicate that this is a reference to the parent.
4319 if In_Extended_Main_Source_Unit
(Gen_Id
) then
4320 Set_Is_Instantiated
(Inst_Par
);
4323 -- A common mistake is to replicate the naming scheme of
4324 -- a hierarchy by instantiating a generic child directly,
4325 -- rather than the implicit child in a parent instance:
4327 -- generic .. package Gpar is ..
4328 -- generic .. package Gpar.Child is ..
4329 -- package Par is new Gpar ();
4332 -- package Par.Child is new Gpar.Child ();
4333 -- rather than Par.Child
4335 -- In this case the instantiation is within Par, which is
4336 -- an instance, but Gpar does not denote Par because we are
4337 -- not IN the instance of Gpar, so this is illegal. The test
4338 -- below recognizes this particular case.
4340 if Is_Child_Unit
(E
)
4341 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
4342 and then (not In_Instance
4343 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
4347 ("prefix of generic child unit must be instance of parent",
4351 if not In_Open_Scopes
(Inst_Par
)
4352 and then Nkind
(Parent
(Gen_Id
)) not in
4353 N_Generic_Renaming_Declaration
4355 Install_Parent
(Inst_Par
);
4356 Parent_Installed
:= True;
4360 -- If the generic parent does not contain an entity that
4361 -- corresponds to the selector, the instance doesn't either.
4362 -- Analyzing the node will yield the appropriate error message.
4363 -- If the entity is not a child unit, then it is an inner
4364 -- generic in the parent.
4372 if Is_Child_Unit
(Entity
(Gen_Id
))
4374 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4375 and then not In_Open_Scopes
(Inst_Par
)
4377 Install_Parent
(Inst_Par
);
4378 Parent_Installed
:= True;
4382 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
4384 -- Entity already present, analyze prefix, whose meaning may be
4385 -- an instance in the current context. If it is an instance of
4386 -- a relative within another, the proper parent may still have
4387 -- to be installed, if they are not of the same generation.
4389 Analyze
(Prefix
(Gen_Id
));
4390 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4392 if In_Enclosing_Instance
then
4395 elsif Present
(Entity
(Gen_Id
))
4396 and then Is_Child_Unit
(Entity
(Gen_Id
))
4397 and then not In_Open_Scopes
(Inst_Par
)
4399 Install_Parent
(Inst_Par
);
4400 Parent_Installed
:= True;
4403 elsif In_Enclosing_Instance
then
4405 -- The child unit is found in some enclosing scope
4412 -- If this is the renaming of the implicit child in a parent
4413 -- instance, recover the parent name and install it.
4415 if Is_Entity_Name
(Gen_Id
) then
4416 E
:= Entity
(Gen_Id
);
4418 if Is_Generic_Unit
(E
)
4419 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
4420 and then Is_Child_Unit
(Renamed_Object
(E
))
4421 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
4422 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
4425 New_Copy_Tree
(Name
(Parent
(E
))));
4426 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4428 if not In_Open_Scopes
(Inst_Par
) then
4429 Install_Parent
(Inst_Par
);
4430 Parent_Installed
:= True;
4433 -- If it is a child unit of a non-generic parent, it may be
4434 -- use-visible and given by a direct name. Install parent as
4437 elsif Is_Generic_Unit
(E
)
4438 and then Is_Child_Unit
(E
)
4440 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4441 and then not Is_Generic_Unit
(Scope
(E
))
4443 if not In_Open_Scopes
(Scope
(E
)) then
4444 Install_Parent
(Scope
(E
));
4445 Parent_Installed
:= True;
4450 end Check_Generic_Child_Unit
;
4452 -----------------------------
4453 -- Check_Hidden_Child_Unit --
4454 -----------------------------
4456 procedure Check_Hidden_Child_Unit
4458 Gen_Unit
: Entity_Id
;
4459 Act_Decl_Id
: Entity_Id
)
4461 Gen_Id
: constant Node_Id
:= Name
(N
);
4464 if Is_Child_Unit
(Gen_Unit
)
4465 and then Is_Child_Unit
(Act_Decl_Id
)
4466 and then Nkind
(Gen_Id
) = N_Expanded_Name
4467 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
4468 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
4470 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
4472 ("generic unit & is implicitly declared in &",
4473 Defining_Unit_Name
(N
), Gen_Unit
);
4474 Error_Msg_N
("\instance must have different name",
4475 Defining_Unit_Name
(N
));
4477 end Check_Hidden_Child_Unit
;
4479 ------------------------
4480 -- Check_Private_View --
4481 ------------------------
4483 procedure Check_Private_View
(N
: Node_Id
) is
4484 T
: constant Entity_Id
:= Etype
(N
);
4488 -- Exchange views if the type was not private in the generic but is
4489 -- private at the point of instantiation. Do not exchange views if
4490 -- the scope of the type is in scope. This can happen if both generic
4491 -- and instance are sibling units, or if type is defined in a parent.
4492 -- In this case the visibility of the type will be correct for all
4496 BT
:= Base_Type
(T
);
4498 if Is_Private_Type
(T
)
4499 and then not Has_Private_View
(N
)
4500 and then Present
(Full_View
(T
))
4501 and then not In_Open_Scopes
(Scope
(T
))
4503 -- In the generic, the full type was visible. Save the
4504 -- private entity, for subsequent exchange.
4508 elsif Has_Private_View
(N
)
4509 and then not Is_Private_Type
(T
)
4510 and then not Has_Been_Exchanged
(T
)
4511 and then Etype
(Get_Associated_Node
(N
)) /= T
4513 -- Only the private declaration was visible in the generic. If
4514 -- the type appears in a subtype declaration, the subtype in the
4515 -- instance must have a view compatible with that of its parent,
4516 -- which must be exchanged (see corresponding code in Restore_
4517 -- Private_Views). Otherwise, if the type is defined in a parent
4518 -- unit, leave full visibility within instance, which is safe.
4520 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
4521 and then not Is_Private_Type
(Base_Type
(T
))
4522 and then Comes_From_Source
(Base_Type
(T
))
4526 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
4527 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
4529 Append_Elmt
(T
, Exchanged_Views
);
4530 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
4533 -- For composite types with inconsistent representation
4534 -- exchange component types accordingly.
4536 elsif Is_Access_Type
(T
)
4537 and then Is_Private_Type
(Designated_Type
(T
))
4538 and then not Has_Private_View
(N
)
4539 and then Present
(Full_View
(Designated_Type
(T
)))
4541 Switch_View
(Designated_Type
(T
));
4543 elsif Is_Array_Type
(T
)
4544 and then Is_Private_Type
(Component_Type
(T
))
4545 and then not Has_Private_View
(N
)
4546 and then Present
(Full_View
(Component_Type
(T
)))
4548 Switch_View
(Component_Type
(T
));
4550 elsif Is_Private_Type
(T
)
4551 and then Present
(Full_View
(T
))
4552 and then Is_Array_Type
(Full_View
(T
))
4553 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
4557 -- Finally, a non-private subtype may have a private base type,
4558 -- which must be exchanged for consistency. This can happen when
4559 -- instantiating a package body, when the scope stack is empty
4560 -- but in fact the subtype and the base type are declared in an
4563 elsif not Is_Private_Type
(T
)
4564 and then not Has_Private_View
(N
)
4565 and then Is_Private_Type
(Base_Type
(T
))
4566 and then Present
(Full_View
(BT
))
4567 and then not Is_Generic_Type
(BT
)
4568 and then not In_Open_Scopes
(BT
)
4570 Append_Elmt
(Full_View
(BT
), Exchanged_Views
);
4571 Exchange_Declarations
(BT
);
4574 end Check_Private_View
;
4576 --------------------------
4577 -- Contains_Instance_Of --
4578 --------------------------
4580 function Contains_Instance_Of
4583 N
: Node_Id
) return Boolean
4591 -- Verify that there are no circular instantiations. We check whether
4592 -- the unit contains an instance of the current scope or some enclosing
4593 -- scope (in case one of the instances appears in a subunit). Longer
4594 -- circularities involving subunits might seem too pathological to
4595 -- consider, but they were not too pathological for the authors of
4596 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4597 -- enclosing generic scopes as containing an instance.
4600 -- Within a generic subprogram body, the scope is not generic, to
4601 -- allow for recursive subprograms. Use the declaration to determine
4602 -- whether this is a generic unit.
4604 if Ekind
(Scop
) = E_Generic_Package
4605 or else (Is_Subprogram
(Scop
)
4606 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
4607 N_Generic_Subprogram_Declaration
)
4609 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
4611 while Present
(Elmt
) loop
4612 if Node
(Elmt
) = Scop
then
4613 Error_Msg_Node_2
:= Inner
;
4615 ("circular Instantiation: & instantiated within &!",
4619 elsif Node
(Elmt
) = Inner
then
4622 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
4623 Error_Msg_Node_2
:= Inner
;
4625 ("circular Instantiation: & instantiated within &!",
4633 -- Indicate that Inner is being instantiated within Scop.
4635 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
4638 if Scop
= Standard_Standard
then
4641 Scop
:= Scope
(Scop
);
4646 end Contains_Instance_Of
;
4648 -----------------------
4649 -- Copy_Generic_Node --
4650 -----------------------
4652 function Copy_Generic_Node
4654 Parent_Id
: Node_Id
;
4655 Instantiating
: Boolean) return Node_Id
4660 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
4661 -- Check the given value of one of the Fields referenced by the
4662 -- current node to determine whether to copy it recursively. The
4663 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4664 -- value (Sloc, Uint, Char) in which case it need not be copied.
4666 procedure Copy_Descendants
;
4667 -- Common utility for various nodes.
4669 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
4670 -- Make copy of element list.
4672 function Copy_Generic_List
4674 Parent_Id
: Node_Id
) return List_Id
;
4675 -- Apply Copy_Node recursively to the members of a node list.
4677 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
4678 -- True if an identifier is part of the defining program unit name
4679 -- of a child unit. The entity of such an identifier must be kept
4680 -- (for ASIS use) even though as the name of an enclosing generic
4681 -- it would otherwise not be preserved in the generic tree.
4683 ----------------------
4684 -- Copy_Descendants --
4685 ----------------------
4687 procedure Copy_Descendants
is
4689 use Atree
.Unchecked_Access
;
4690 -- This code section is part of the implementation of an untyped
4691 -- tree traversal, so it needs direct access to node fields.
4694 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
4695 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
4696 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
4697 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
4698 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
4699 end Copy_Descendants
;
4701 -----------------------------
4702 -- Copy_Generic_Descendant --
4703 -----------------------------
4705 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
4707 if D
= Union_Id
(Empty
) then
4710 elsif D
in Node_Range
then
4712 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
4714 elsif D
in List_Range
then
4715 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
4717 elsif D
in Elist_Range
then
4718 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
4720 -- Nothing else is copyable (e.g. Uint values), return as is
4725 end Copy_Generic_Descendant
;
4727 ------------------------
4728 -- Copy_Generic_Elist --
4729 ------------------------
4731 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
4738 M
:= First_Elmt
(E
);
4739 while Present
(M
) loop
4741 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
4750 end Copy_Generic_Elist
;
4752 -----------------------
4753 -- Copy_Generic_List --
4754 -----------------------
4756 function Copy_Generic_List
4758 Parent_Id
: Node_Id
) return List_Id
4766 Set_Parent
(New_L
, Parent_Id
);
4769 while Present
(N
) loop
4770 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
4779 end Copy_Generic_List
;
4781 ---------------------------
4782 -- In_Defining_Unit_Name --
4783 ---------------------------
4785 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
4787 return Present
(Parent
(Nam
))
4788 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
4790 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
4791 and then In_Defining_Unit_Name
(Parent
(Nam
))));
4792 end In_Defining_Unit_Name
;
4794 -- Start of processing for Copy_Generic_Node
4801 New_N
:= New_Copy
(N
);
4803 if Instantiating
then
4804 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
4807 if not Is_List_Member
(N
) then
4808 Set_Parent
(New_N
, Parent_Id
);
4811 -- If defining identifier, then all fields have been copied already
4813 if Nkind
(New_N
) in N_Entity
then
4816 -- Special casing for identifiers and other entity names and operators
4818 elsif Nkind
(New_N
) = N_Identifier
4819 or else Nkind
(New_N
) = N_Character_Literal
4820 or else Nkind
(New_N
) = N_Expanded_Name
4821 or else Nkind
(New_N
) = N_Operator_Symbol
4822 or else Nkind
(New_N
) in N_Op
4824 if not Instantiating
then
4826 -- Link both nodes in order to assign subsequently the
4827 -- entity of the copy to the original node, in case this
4828 -- is a global reference.
4830 Set_Associated_Node
(N
, New_N
);
4832 -- If we are within an instantiation, this is a nested generic
4833 -- that has already been analyzed at the point of definition. We
4834 -- must preserve references that were global to the enclosing
4835 -- parent at that point. Other occurrences, whether global or
4836 -- local to the current generic, must be resolved anew, so we
4837 -- reset the entity in the generic copy. A global reference has
4838 -- a smaller depth than the parent, or else the same depth in
4839 -- case both are distinct compilation units.
4841 -- It is also possible for Current_Instantiated_Parent to be
4842 -- defined, and for this not to be a nested generic, namely
4843 -- if the unit is loaded through Rtsfind. In that case, the
4844 -- entity of New_N is only a link to the associated node, and
4845 -- not a defining occurrence.
4847 -- The entities for parent units in the defining_program_unit
4848 -- of a generic child unit are established when the context of
4849 -- the unit is first analyzed, before the generic copy is made.
4850 -- They are preserved in the copy for use in ASIS queries.
4852 Ent
:= Entity
(New_N
);
4854 if No
(Current_Instantiated_Parent
.Gen_Id
) then
4856 or else Nkind
(Ent
) /= N_Defining_Identifier
4857 or else not In_Defining_Unit_Name
(N
)
4859 Set_Associated_Node
(New_N
, Empty
);
4864 not (Nkind
(Ent
) = N_Defining_Identifier
4866 Nkind
(Ent
) = N_Defining_Character_Literal
4868 Nkind
(Ent
) = N_Defining_Operator_Symbol
)
4869 or else No
(Scope
(Ent
))
4870 or else Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
4871 or else (Scope_Depth
(Scope
(Ent
)) >
4872 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
4874 Get_Source_Unit
(Ent
) =
4875 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
4877 Set_Associated_Node
(New_N
, Empty
);
4880 -- Case of instantiating identifier or some other name or operator
4883 -- If the associated node is still defined, the entity in
4884 -- it is global, and must be copied to the instance.
4885 -- If this copy is being made for a body to inline, it is
4886 -- applied to an instantiated tree, and the entity is already
4887 -- present and must be also preserved.
4890 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
4892 if Present
(Assoc
) then
4893 if Nkind
(Assoc
) = Nkind
(N
) then
4894 Set_Entity
(New_N
, Entity
(Assoc
));
4895 Check_Private_View
(N
);
4897 elsif Nkind
(Assoc
) = N_Function_Call
then
4898 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
4900 elsif (Nkind
(Assoc
) = N_Defining_Identifier
4901 or else Nkind
(Assoc
) = N_Defining_Character_Literal
4902 or else Nkind
(Assoc
) = N_Defining_Operator_Symbol
)
4903 and then Expander_Active
4905 -- Inlining case: we are copying a tree that contains
4906 -- global entities, which are preserved in the copy
4907 -- to be used for subsequent inlining.
4912 Set_Entity
(New_N
, Empty
);
4918 -- For expanded name, we must copy the Prefix and Selector_Name
4920 if Nkind
(N
) = N_Expanded_Name
then
4922 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
4924 Set_Selector_Name
(New_N
,
4925 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
4927 -- For operators, we must copy the right operand
4929 elsif Nkind
(N
) in N_Op
then
4930 Set_Right_Opnd
(New_N
,
4931 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
4933 -- And for binary operators, the left operand as well
4935 if Nkind
(N
) in N_Binary_Op
then
4936 Set_Left_Opnd
(New_N
,
4937 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
4941 -- Special casing for stubs
4943 elsif Nkind
(N
) in N_Body_Stub
then
4945 -- In any case, we must copy the specification or defining
4946 -- identifier as appropriate.
4948 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4949 Set_Specification
(New_N
,
4950 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
4953 Set_Defining_Identifier
(New_N
,
4955 (Defining_Identifier
(N
), New_N
, Instantiating
));
4958 -- If we are not instantiating, then this is where we load and
4959 -- analyze subunits, i.e. at the point where the stub occurs. A
4960 -- more permissivle system might defer this analysis to the point
4961 -- of instantiation, but this seems to complicated for now.
4963 if not Instantiating
then
4965 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
4967 Unum
: Unit_Number_Type
;
4973 (Load_Name
=> Subunit_Name
,
4978 -- If the proper body is not found, a warning message will
4979 -- be emitted when analyzing the stub, or later at the the
4980 -- point of instantiation. Here we just leave the stub as is.
4982 if Unum
= No_Unit
then
4983 Subunits_Missing
:= True;
4984 goto Subunit_Not_Found
;
4987 Subunit
:= Cunit
(Unum
);
4989 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
4990 Error_Msg_Sloc
:= Sloc
(N
);
4992 ("expected SEPARATE subunit to complete stub at#,"
4993 & " found child unit", Subunit
);
4994 goto Subunit_Not_Found
;
4997 -- We must create a generic copy of the subunit, in order
4998 -- to perform semantic analysis on it, and we must replace
4999 -- the stub in the original generic unit with the subunit,
5000 -- in order to preserve non-local references within.
5002 -- Only the proper body needs to be copied. Library_Unit and
5003 -- context clause are simply inherited by the generic copy.
5004 -- Note that the copy (which may be recursive if there are
5005 -- nested subunits) must be done first, before attaching it
5006 -- to the enclosing generic.
5010 (Proper_Body
(Unit
(Subunit
)),
5011 Empty
, Instantiating
=> False);
5013 -- Now place the original proper body in the original
5014 -- generic unit. This is a body, not a compilation unit.
5016 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
5017 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
5018 Set_Was_Originally_Stub
(N
);
5020 -- Finally replace the body of the subunit with its copy,
5021 -- and make this new subunit into the library unit of the
5022 -- generic copy, which does not have stubs any longer.
5024 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
5025 Set_Library_Unit
(New_N
, Subunit
);
5026 Inherit_Context
(Unit
(Subunit
), N
);
5029 -- If we are instantiating, this must be an error case, since
5030 -- otherwise we would have replaced the stub node by the proper
5031 -- body that corresponds. So just ignore it in the copy (i.e.
5032 -- we have copied it, and that is good enough).
5038 <<Subunit_Not_Found
>> null;
5040 -- If the node is a compilation unit, it is the subunit of a stub,
5041 -- which has been loaded already (see code below). In this case,
5042 -- the library unit field of N points to the parent unit (which
5043 -- is a compilation unit) and need not (and cannot!) be copied.
5045 -- When the proper body of the stub is analyzed, thie library_unit
5046 -- link is used to establish the proper context (see sem_ch10).
5048 -- The other fields of a compilation unit are copied as usual
5050 elsif Nkind
(N
) = N_Compilation_Unit
then
5052 -- This code can only be executed when not instantiating, because
5053 -- in the copy made for an instantiation, the compilation unit
5054 -- node has disappeared at the point that a stub is replaced by
5057 pragma Assert
(not Instantiating
);
5059 Set_Context_Items
(New_N
,
5060 Copy_Generic_List
(Context_Items
(N
), New_N
));
5063 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5065 Set_First_Inlined_Subprogram
(New_N
,
5067 (First_Inlined_Subprogram
(N
), New_N
, False));
5069 Set_Aux_Decls_Node
(New_N
,
5070 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5072 -- For an assignment node, the assignment is known to be semantically
5073 -- legal if we are instantiating the template. This avoids incorrect
5074 -- diagnostics in generated code.
5076 elsif Nkind
(N
) = N_Assignment_Statement
then
5078 -- Copy name and expression fields in usual manner
5081 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5083 Set_Expression
(New_N
,
5084 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5086 if Instantiating
then
5087 Set_Assignment_OK
(Name
(New_N
), True);
5090 elsif Nkind
(N
) = N_Aggregate
5091 or else Nkind
(N
) = N_Extension_Aggregate
5094 if not Instantiating
then
5095 Set_Associated_Node
(N
, New_N
);
5098 if Present
(Get_Associated_Node
(N
))
5099 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5101 -- In the generic the aggregate has some composite type. If at
5102 -- the point of instantiation the type has a private view,
5103 -- install the full view (and that of its ancestors, if any).
5106 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5111 and then Is_Private_Type
(T
)
5117 and then Is_Tagged_Type
(T
)
5118 and then Is_Derived_Type
(T
)
5120 Rt
:= Root_Type
(T
);
5125 if Is_Private_Type
(T
) then
5136 -- Do not copy the associated node, which points to
5137 -- the generic copy of the aggregate.
5140 use Atree
.Unchecked_Access
;
5141 -- This code section is part of the implementation of an untyped
5142 -- tree traversal, so it needs direct access to node fields.
5145 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5146 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5147 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5148 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5151 -- Allocators do not have an identifier denoting the access type,
5152 -- so we must locate it through the expression to check whether
5153 -- the views are consistent.
5155 elsif Nkind
(N
) = N_Allocator
5156 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5157 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5158 and then Instantiating
5161 T
: constant Node_Id
:=
5162 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5167 -- Retrieve the allocator node in the generic copy.
5169 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5171 and then Is_Private_Type
(Acc_T
)
5173 Switch_View
(Acc_T
);
5180 -- For a proper body, we must catch the case of a proper body that
5181 -- replaces a stub. This represents the point at which a separate
5182 -- compilation unit, and hence template file, may be referenced, so
5183 -- we must make a new source instantiation entry for the template
5184 -- of the subunit, and ensure that all nodes in the subunit are
5185 -- adjusted using this new source instantiation entry.
5187 elsif Nkind
(N
) in N_Proper_Body
then
5189 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
5192 if Instantiating
and then Was_Originally_Stub
(N
) then
5193 Create_Instantiation_Source
5194 (Instantiation_Node
,
5195 Defining_Entity
(N
),
5200 -- Now copy the fields of the proper body, using the new
5201 -- adjustment factor if one was needed as per test above.
5205 -- Restore the original adjustment factor in case changed
5207 S_Adjustment
:= Save_Adjustment
;
5210 -- Don't copy Ident or Comment pragmas, since the comment belongs
5211 -- to the generic unit, not to the instantiating unit.
5213 elsif Nkind
(N
) = N_Pragma
5214 and then Instantiating
5217 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(Chars
(N
));
5220 if Prag_Id
= Pragma_Ident
5221 or else Prag_Id
= Pragma_Comment
5223 New_N
:= Make_Null_Statement
(Sloc
(N
));
5230 elsif Nkind
(N
) = N_Integer_Literal
5231 or else Nkind
(N
) = N_Real_Literal
5233 -- No descendant fields need traversing
5237 -- For the remaining nodes, copy recursively their descendants
5243 and then Nkind
(N
) = N_Subprogram_Body
5245 Set_Generic_Parent
(Specification
(New_N
), N
);
5250 end Copy_Generic_Node
;
5252 ----------------------------
5253 -- Denotes_Formal_Package --
5254 ----------------------------
5256 function Denotes_Formal_Package
5258 On_Exit
: Boolean := False) return Boolean
5261 Scop
: constant Entity_Id
:= Scope
(Pack
);
5268 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
5270 Par
:= Current_Instantiated_Parent
.Act_Id
;
5273 if Ekind
(Scop
) = E_Generic_Package
5274 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
5275 N_Generic_Subprogram_Declaration
5279 elsif Nkind
(Parent
(Pack
)) = N_Formal_Package_Declaration
then
5286 -- Check whether this package is associated with a formal
5287 -- package of the enclosing instantiation. Iterate over the
5288 -- list of renamings.
5290 E
:= First_Entity
(Par
);
5291 while Present
(E
) loop
5292 if Ekind
(E
) /= E_Package
5293 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
5296 elsif Renamed_Object
(E
) = Par
then
5299 elsif Renamed_Object
(E
) = Pack
then
5308 end Denotes_Formal_Package
;
5314 procedure End_Generic
is
5316 -- ??? More things could be factored out in this
5317 -- routine. Should probably be done at a later stage.
5319 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
5320 Generic_Flags
.Decrement_Last
;
5322 Expander_Mode_Restore
;
5325 ----------------------
5326 -- Find_Actual_Type --
5327 ----------------------
5329 function Find_Actual_Type
5331 Gen_Scope
: Entity_Id
) return Entity_Id
5336 if not Is_Child_Unit
(Gen_Scope
) then
5337 return Get_Instance_Of
(Typ
);
5339 elsif not Is_Generic_Type
(Typ
)
5340 or else Scope
(Typ
) = Gen_Scope
5342 return Get_Instance_Of
(Typ
);
5345 T
:= Current_Entity
(Typ
);
5346 while Present
(T
) loop
5347 if In_Open_Scopes
(Scope
(T
)) then
5356 end Find_Actual_Type
;
5358 ----------------------------
5359 -- Freeze_Subprogram_Body --
5360 ----------------------------
5362 procedure Freeze_Subprogram_Body
5363 (Inst_Node
: Node_Id
;
5365 Pack_Id
: Entity_Id
)
5368 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
5369 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
5374 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
5375 -- Yields True if N1 and N2 appear in the same compilation unit,
5376 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5377 -- traversal of the tree for the unit.
5379 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
5380 -- Find innermost package body that encloses the given node, and which
5381 -- is not a compilation unit. Freeze nodes for the instance, or for its
5382 -- enclosing body, may be inserted after the enclosing_body of the
5385 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
5386 -- Find entity for given package body, and locate or create a freeze
5389 function True_Parent
(N
: Node_Id
) return Node_Id
;
5390 -- For a subunit, return parent of corresponding stub.
5396 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
5402 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
5403 -- Find distance from given node to enclosing compilation unit.
5409 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
5412 and then Nkind
(P
) /= N_Compilation_Unit
5414 P
:= True_Parent
(P
);
5419 -- Start of procesing for Earlier
5422 Find_Depth
(P1
, D1
);
5423 Find_Depth
(P2
, D2
);
5433 P1
:= True_Parent
(P1
);
5438 P2
:= True_Parent
(P2
);
5442 -- At this point P1 and P2 are at the same distance from the root.
5443 -- We examine their parents until we find a common declarative
5444 -- list, at which point we can establish their relative placement
5445 -- by comparing their ultimate slocs. If we reach the root,
5446 -- N1 and N2 do not descend from the same declarative list (e.g.
5447 -- one is nested in the declarative part and the other is in a block
5448 -- in the statement part) and the earlier one is already frozen.
5450 while not Is_List_Member
(P1
)
5451 or else not Is_List_Member
(P2
)
5452 or else List_Containing
(P1
) /= List_Containing
(P2
)
5454 P1
:= True_Parent
(P1
);
5455 P2
:= True_Parent
(P2
);
5457 if Nkind
(Parent
(P1
)) = N_Subunit
then
5458 P1
:= Corresponding_Stub
(Parent
(P1
));
5461 if Nkind
(Parent
(P2
)) = N_Subunit
then
5462 P2
:= Corresponding_Stub
(Parent
(P2
));
5471 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
5474 --------------------
5475 -- Enclosing_Body --
5476 --------------------
5478 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
5479 P
: Node_Id
:= Parent
(N
);
5483 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
5485 if Nkind
(P
) = N_Package_Body
then
5487 if Nkind
(Parent
(P
)) = N_Subunit
then
5488 return Corresponding_Stub
(Parent
(P
));
5494 P
:= True_Parent
(P
);
5500 -------------------------
5501 -- Package_Freeze_Node --
5502 -------------------------
5504 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
5508 if Nkind
(B
) = N_Package_Body
then
5509 Id
:= Corresponding_Spec
(B
);
5511 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
5512 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
5515 Ensure_Freeze_Node
(Id
);
5516 return Freeze_Node
(Id
);
5517 end Package_Freeze_Node
;
5523 function True_Parent
(N
: Node_Id
) return Node_Id
is
5525 if Nkind
(Parent
(N
)) = N_Subunit
then
5526 return Parent
(Corresponding_Stub
(Parent
(N
)));
5532 -- Start of processing of Freeze_Subprogram_Body
5535 -- If the instance and the generic body appear within the same
5536 -- unit, and the instance preceeds the generic, the freeze node for
5537 -- the instance must appear after that of the generic. If the generic
5538 -- is nested within another instance I2, then current instance must
5539 -- be frozen after I2. In both cases, the freeze nodes are those of
5540 -- enclosing packages. Otherwise, the freeze node is placed at the end
5541 -- of the current declarative part.
5543 Enc_G
:= Enclosing_Body
(Gen_Body
);
5544 Enc_I
:= Enclosing_Body
(Inst_Node
);
5545 Ensure_Freeze_Node
(Pack_Id
);
5546 F_Node
:= Freeze_Node
(Pack_Id
);
5548 if Is_Generic_Instance
(Par
)
5549 and then Present
(Freeze_Node
(Par
))
5551 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
5553 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
5555 -- The parent was a premature instantiation. Insert freeze
5556 -- node at the end the current declarative part.
5558 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5561 Insert_After
(Freeze_Node
(Par
), F_Node
);
5564 -- The body enclosing the instance should be frozen after the body
5565 -- that includes the generic, because the body of the instance may
5566 -- make references to entities therein. If the two are not in the
5567 -- same declarative part, or if the one enclosing the instance is
5568 -- frozen already, freeze the instance at the end of the current
5569 -- declarative part.
5571 elsif Is_Generic_Instance
(Par
)
5572 and then Present
(Freeze_Node
(Par
))
5573 and then Present
(Enc_I
)
5575 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
5577 (Nkind
(Enc_I
) = N_Package_Body
5579 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
5581 -- The enclosing package may contain several instances. Rather
5582 -- than computing the earliest point at which to insert its
5583 -- freeze node, we place it at the end of the declarative part
5584 -- of the parent of the generic.
5586 Insert_After_Last_Decl
5587 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
5590 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5592 elsif Present
(Enc_G
)
5593 and then Present
(Enc_I
)
5594 and then Enc_G
/= Enc_I
5595 and then Earlier
(Inst_Node
, Gen_Body
)
5597 if Nkind
(Enc_G
) = N_Package_Body
then
5598 E_G_Id
:= Corresponding_Spec
(Enc_G
);
5599 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
5601 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
5604 -- Freeze package that encloses instance, and place node after
5605 -- package that encloses generic. If enclosing package is already
5606 -- frozen we have to assume it is at the proper place. This may
5607 -- be a potential ABE that requires dynamic checking.
5609 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
5611 -- Freeze enclosing subunit before instance
5613 Ensure_Freeze_Node
(E_G_Id
);
5615 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
5616 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
5619 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5622 -- If none of the above, insert freeze node at the end of the
5623 -- current declarative part.
5625 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5627 end Freeze_Subprogram_Body
;
5633 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
5635 return Generic_Renamings
.Table
(E
).Gen_Id
;
5638 ---------------------
5639 -- Get_Instance_Of --
5640 ---------------------
5642 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
5643 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
5646 if Res
/= Assoc_Null
then
5647 return Generic_Renamings
.Table
(Res
).Act_Id
;
5649 -- On exit, entity is not instantiated: not a generic parameter,
5650 -- or else parameter of an inner generic unit.
5654 end Get_Instance_Of
;
5656 ------------------------------------
5657 -- Get_Package_Instantiation_Node --
5658 ------------------------------------
5660 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
5661 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
5665 -- If the instantiation is a compilation unit that does not need a
5666 -- body then the instantiation node has been rewritten as a package
5667 -- declaration for the instance, and we return the original node.
5669 -- If it is a compilation unit and the instance node has not been
5670 -- rewritten, then it is still the unit of the compilation. Finally,
5671 -- if a body is present, this is a parent of the main unit whose body
5672 -- has been compiled for inlining purposes, and the instantiation node
5673 -- has been rewritten with the instance body.
5675 -- Otherwise the instantiation node appears after the declaration.
5676 -- If the entity is a formal package, the declaration may have been
5677 -- rewritten as a generic declaration (in the case of a formal with a
5678 -- box) or left as a formal package declaration if it has actuals, and
5679 -- is found with a forward search.
5681 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
5682 if Nkind
(Decl
) = N_Package_Declaration
5683 and then Present
(Corresponding_Body
(Decl
))
5685 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
5688 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
5689 return Original_Node
(Decl
);
5691 return Unit
(Parent
(Decl
));
5694 elsif Nkind
(Decl
) = N_Generic_Package_Declaration
5695 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
5697 return Original_Node
(Decl
);
5700 Inst
:= Next
(Decl
);
5701 while Nkind
(Inst
) /= N_Package_Instantiation
5702 and then Nkind
(Inst
) /= N_Formal_Package_Declaration
5709 end Get_Package_Instantiation_Node
;
5711 ------------------------
5712 -- Has_Been_Exchanged --
5713 ------------------------
5715 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
5716 Next
: Elmt_Id
:= First_Elmt
(Exchanged_Views
);
5719 while Present
(Next
) loop
5720 if Full_View
(Node
(Next
)) = E
then
5728 end Has_Been_Exchanged
;
5734 function Hash
(F
: Entity_Id
) return HTable_Range
is
5736 return HTable_Range
(F
mod HTable_Size
);
5739 ------------------------
5740 -- Hide_Current_Scope --
5741 ------------------------
5743 procedure Hide_Current_Scope
is
5744 C
: constant Entity_Id
:= Current_Scope
;
5748 Set_Is_Hidden_Open_Scope
(C
);
5749 E
:= First_Entity
(C
);
5751 while Present
(E
) loop
5752 if Is_Immediately_Visible
(E
) then
5753 Set_Is_Immediately_Visible
(E
, False);
5754 Append_Elmt
(E
, Hidden_Entities
);
5760 -- Make the scope name invisible as well. This is necessary, but
5761 -- might conflict with calls to Rtsfind later on, in case the scope
5762 -- is a predefined one. There is no clean solution to this problem, so
5763 -- for now we depend on the user not redefining Standard itself in one
5764 -- of the parent units.
5766 if Is_Immediately_Visible
(C
)
5767 and then C
/= Standard_Standard
5769 Set_Is_Immediately_Visible
(C
, False);
5770 Append_Elmt
(C
, Hidden_Entities
);
5773 end Hide_Current_Scope
;
5779 procedure Init_Env
is
5780 Saved
: Instance_Env
;
5783 Saved
.Ada_Version
:= Ada_Version
;
5784 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
5785 Saved
.Exchanged_Views
:= Exchanged_Views
;
5786 Saved
.Hidden_Entities
:= Hidden_Entities
;
5787 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
5788 Instance_Envs
.Increment_Last
;
5789 Instance_Envs
.Table
(Instance_Envs
.Last
) := Saved
;
5791 Exchanged_Views
:= New_Elmt_List
;
5792 Hidden_Entities
:= New_Elmt_List
;
5794 -- Make dummy entry for Instantiated parent. If generic unit is
5795 -- legal, this is set properly in Set_Instance_Env.
5797 Current_Instantiated_Parent
:=
5798 (Current_Scope
, Current_Scope
, Assoc_Null
);
5801 ------------------------------
5802 -- In_Same_Declarative_Part --
5803 ------------------------------
5805 function In_Same_Declarative_Part
5807 Inst
: Node_Id
) return Boolean
5809 Decls
: constant Node_Id
:= Parent
(F_Node
);
5810 Nod
: Node_Id
:= Parent
(Inst
);
5813 while Present
(Nod
) loop
5817 elsif Nkind
(Nod
) = N_Subprogram_Body
5818 or else Nkind
(Nod
) = N_Package_Body
5819 or else Nkind
(Nod
) = N_Task_Body
5820 or else Nkind
(Nod
) = N_Protected_Body
5821 or else Nkind
(Nod
) = N_Block_Statement
5825 elsif Nkind
(Nod
) = N_Subunit
then
5826 Nod
:= Corresponding_Stub
(Nod
);
5828 elsif Nkind
(Nod
) = N_Compilation_Unit
then
5831 Nod
:= Parent
(Nod
);
5836 end In_Same_Declarative_Part
;
5838 ---------------------
5839 -- In_Main_Context --
5840 ---------------------
5842 function In_Main_Context
(E
: Entity_Id
) return Boolean is
5848 if not Is_Compilation_Unit
(E
)
5849 or else Ekind
(E
) /= E_Package
5850 or else In_Private_Part
(E
)
5855 Context
:= Context_Items
(Cunit
(Main_Unit
));
5857 Clause
:= First
(Context
);
5858 while Present
(Clause
) loop
5859 if Nkind
(Clause
) = N_With_Clause
then
5860 Nam
:= Name
(Clause
);
5862 -- If the current scope is part of the context of the main unit,
5863 -- analysis of the corresponding with_clause is not complete, and
5864 -- the entity is not set. We use the Chars field directly, which
5865 -- might produce false positives in rare cases, but guarantees
5866 -- that we produce all the instance bodies we will need.
5868 if (Nkind
(Nam
) = N_Identifier
5869 and then Chars
(Nam
) = Chars
(E
))
5870 or else (Nkind
(Nam
) = N_Selected_Component
5871 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
5881 end In_Main_Context
;
5883 ---------------------
5884 -- Inherit_Context --
5885 ---------------------
5887 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
5888 Current_Context
: List_Id
;
5889 Current_Unit
: Node_Id
;
5894 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
5896 -- The inherited context is attached to the enclosing compilation
5897 -- unit. This is either the main unit, or the declaration for the
5898 -- main unit (in case the instantation appears within the package
5899 -- declaration and the main unit is its body).
5901 Current_Unit
:= Parent
(Inst
);
5902 while Present
(Current_Unit
)
5903 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
5905 Current_Unit
:= Parent
(Current_Unit
);
5908 Current_Context
:= Context_Items
(Current_Unit
);
5910 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
5911 while Present
(Item
) loop
5912 if Nkind
(Item
) = N_With_Clause
then
5913 New_I
:= New_Copy
(Item
);
5914 Set_Implicit_With
(New_I
, True);
5915 Append
(New_I
, Current_Context
);
5921 end Inherit_Context
;
5927 procedure Initialize
is
5929 Generic_Renamings
.Init
;
5932 Generic_Renamings_HTable
.Reset
;
5933 Circularity_Detected
:= False;
5934 Exchanged_Views
:= No_Elist
;
5935 Hidden_Entities
:= No_Elist
;
5938 ----------------------------
5939 -- Insert_After_Last_Decl --
5940 ----------------------------
5942 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
5943 L
: List_Id
:= List_Containing
(N
);
5944 P
: constant Node_Id
:= Parent
(L
);
5947 if not Is_List_Member
(F_Node
) then
5948 if Nkind
(P
) = N_Package_Specification
5949 and then L
= Visible_Declarations
(P
)
5950 and then Present
(Private_Declarations
(P
))
5951 and then not Is_Empty_List
(Private_Declarations
(P
))
5953 L
:= Private_Declarations
(P
);
5956 Insert_After
(Last
(L
), F_Node
);
5958 end Insert_After_Last_Decl
;
5964 procedure Install_Body
5965 (Act_Body
: Node_Id
;
5970 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
5971 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
5972 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
5973 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
5974 Gen_Unit
: constant Node_Id
:=
5975 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
5976 Orig_Body
: Node_Id
:= Gen_Body
;
5978 Body_Unit
: Node_Id
;
5980 Must_Delay
: Boolean;
5982 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
5983 -- Find subprogram (if any) that encloses instance and/or generic body.
5985 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
5986 -- If the instance is nested inside a generic unit, the Sloc of the
5987 -- instance indicates the place of the original definition, not the
5988 -- point of the current enclosing instance. Pending a better usage of
5989 -- Slocs to indicate instantiation places, we determine the place of
5990 -- origin of a node by finding the maximum sloc of any ancestor node.
5991 -- Why is this not equivalent fo Top_Level_Location ???
5993 --------------------
5994 -- Enclosing_Subp --
5995 --------------------
5997 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
5998 Scop
: Entity_Id
:= Scope
(Id
);
6001 while Scop
/= Standard_Standard
6002 and then not Is_Overloadable
(Scop
)
6004 Scop
:= Scope
(Scop
);
6014 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
6021 while Present
(N1
) and then N1
/= Act_Unit
loop
6022 if Sloc
(N1
) > Res
then
6032 -- Start of processing for Install_Body
6035 -- If the body is a subunit, the freeze point is the corresponding
6036 -- stub in the current compilation, not the subunit itself.
6038 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
6039 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6041 Orig_Body
:= Gen_Body
;
6044 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6046 -- If the instantiation and the generic definition appear in the
6047 -- same package declaration, this is an early instantiation.
6048 -- If they appear in the same declarative part, it is an early
6049 -- instantiation only if the generic body appears textually later,
6050 -- and the generic body is also in the main unit.
6052 -- If instance is nested within a subprogram, and the generic body is
6053 -- not, the instance is delayed because the enclosing body is. If
6054 -- instance and body are within the same scope, or the same sub-
6055 -- program body, indicate explicitly that the instance is delayed.
6058 (Gen_Unit
= Act_Unit
6059 and then ((Nkind
(Gen_Unit
) = N_Package_Declaration
)
6060 or else Nkind
(Gen_Unit
) = N_Generic_Package_Declaration
6061 or else (Gen_Unit
= Body_Unit
6062 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6063 and then Is_In_Main_Unit
(Gen_Unit
)
6064 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6066 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6068 -- If this is an early instantiation, the freeze node is placed after
6069 -- the generic body. Otherwise, if the generic appears in an instance,
6070 -- we cannot freeze the current instance until the outer one is frozen.
6071 -- This is only relevant if the current instance is nested within some
6072 -- inner scope not itself within the outer instance. If this scope is
6073 -- a package body in the same declarative part as the outer instance,
6074 -- then that body needs to be frozen after the outer instance. Finally,
6075 -- if no delay is needed, we place the freeze node at the end of the
6076 -- current declarative part.
6078 if Expander_Active
then
6079 Ensure_Freeze_Node
(Act_Id
);
6080 F_Node
:= Freeze_Node
(Act_Id
);
6083 Insert_After
(Orig_Body
, F_Node
);
6085 elsif Is_Generic_Instance
(Par
)
6086 and then Present
(Freeze_Node
(Par
))
6087 and then Scope
(Act_Id
) /= Par
6089 -- Freeze instance of inner generic after instance of enclosing
6092 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
6093 Insert_After
(Freeze_Node
(Par
), F_Node
);
6095 -- Freeze package enclosing instance of inner generic after
6096 -- instance of enclosing generic.
6098 elsif Nkind
(Parent
(N
)) = N_Package_Body
6099 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
6103 Enclosing
: constant Entity_Id
:=
6104 Corresponding_Spec
(Parent
(N
));
6107 Insert_After_Last_Decl
(N
, F_Node
);
6108 Ensure_Freeze_Node
(Enclosing
);
6110 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
6111 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
6116 Insert_After_Last_Decl
(N
, F_Node
);
6120 Insert_After_Last_Decl
(N
, F_Node
);
6124 Set_Is_Frozen
(Act_Id
);
6125 Insert_Before
(N
, Act_Body
);
6126 Mark_Rewrite_Insertion
(Act_Body
);
6129 --------------------
6130 -- Install_Parent --
6131 --------------------
6133 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
6134 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
6135 S
: constant Entity_Id
:= Current_Scope
;
6136 Inst_Par
: Entity_Id
;
6137 First_Par
: Entity_Id
;
6138 Inst_Node
: Node_Id
;
6139 Gen_Par
: Entity_Id
;
6140 First_Gen
: Entity_Id
;
6143 procedure Install_Formal_Packages
(Par
: Entity_Id
);
6144 -- If any of the formals of the parent are formal packages with box,
6145 -- their formal parts are visible in the parent and thus in the child
6146 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6147 -- for the unit itself.
6149 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
6150 -- Install the scopes of noninstance parent units ending with Par.
6152 procedure Install_Spec
(Par
: Entity_Id
);
6153 -- The child unit is within the declarative part of the parent, so
6154 -- the declarations within the parent are immediately visible.
6156 -----------------------------
6157 -- Install_Formal_Packages --
6158 -----------------------------
6160 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
6164 E
:= First_Entity
(Par
);
6166 while Present
(E
) loop
6168 if Ekind
(E
) = E_Package
6169 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6171 -- If this is the renaming for the parent instance, done.
6173 if Renamed_Object
(E
) = Par
then
6176 -- The visibility of a formal of an enclosing generic is
6179 elsif Denotes_Formal_Package
(E
) then
6182 elsif Present
(Associated_Formal_Package
(E
))
6183 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
6185 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6186 Set_Is_Hidden
(E
, False);
6192 end Install_Formal_Packages
;
6194 -------------------------------
6195 -- Install_Noninstance_Specs --
6196 -------------------------------
6198 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
6201 and then Par
/= Standard_Standard
6202 and then not In_Open_Scopes
(Par
)
6204 Install_Noninstance_Specs
(Scope
(Par
));
6207 end Install_Noninstance_Specs
;
6213 procedure Install_Spec
(Par
: Entity_Id
) is
6214 Spec
: constant Node_Id
:=
6215 Specification
(Unit_Declaration_Node
(Par
));
6219 Set_Is_Immediately_Visible
(Par
);
6220 Install_Visible_Declarations
(Par
);
6221 Install_Private_Declarations
(Par
);
6222 Set_Use
(Visible_Declarations
(Spec
));
6223 Set_Use
(Private_Declarations
(Spec
));
6226 -- Start of processing for Install_Parent
6229 -- We need to install the parent instance to compile the instantiation
6230 -- of the child, but the child instance must appear in the current
6231 -- scope. Given that we cannot place the parent above the current
6232 -- scope in the scope stack, we duplicate the current scope and unstack
6233 -- both after the instantiation is complete.
6235 -- If the parent is itself the instantiation of a child unit, we must
6236 -- also stack the instantiation of its parent, and so on. Each such
6237 -- ancestor is the prefix of the name in a prior instantiation.
6239 -- If this is a nested instance, the parent unit itself resolves to
6240 -- a renaming of the parent instance, whose declaration we need.
6242 -- Finally, the parent may be a generic (not an instance) when the
6243 -- child unit appears as a formal package.
6247 if Present
(Renamed_Entity
(Inst_Par
)) then
6248 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6251 First_Par
:= Inst_Par
;
6254 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
6256 First_Gen
:= Gen_Par
;
6258 while Present
(Gen_Par
)
6259 and then Is_Child_Unit
(Gen_Par
)
6261 -- Load grandparent instance as well
6263 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
6265 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
6266 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
6268 if Present
(Renamed_Entity
(Inst_Par
)) then
6269 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6274 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
6276 if Present
(Gen_Par
) then
6277 Prepend_Elmt
(Inst_Par
, Ancestors
);
6280 -- Parent is not the name of an instantiation
6282 Install_Noninstance_Specs
(Inst_Par
);
6294 if Present
(First_Gen
) then
6295 Append_Elmt
(First_Par
, Ancestors
);
6298 Install_Noninstance_Specs
(First_Par
);
6301 if not Is_Empty_Elmt_List
(Ancestors
) then
6302 Elmt
:= First_Elmt
(Ancestors
);
6304 while Present
(Elmt
) loop
6305 Install_Spec
(Node
(Elmt
));
6306 Install_Formal_Packages
(Node
(Elmt
));
6317 --------------------------------
6318 -- Instantiate_Formal_Package --
6319 --------------------------------
6321 function Instantiate_Formal_Package
6324 Analyzed_Formal
: Node_Id
) return List_Id
6326 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6327 Actual_Pack
: Entity_Id
;
6328 Formal_Pack
: Entity_Id
;
6329 Gen_Parent
: Entity_Id
;
6332 Parent_Spec
: Node_Id
;
6334 procedure Find_Matching_Actual
6336 Act
: in out Entity_Id
);
6337 -- We need to associate each formal entity in the formal package
6338 -- with the corresponding entity in the actual package. The actual
6339 -- package has been analyzed and possibly expanded, and as a result
6340 -- there is no one-to-one correspondence between the two lists (for
6341 -- example, the actual may include subtypes, itypes, and inherited
6342 -- primitive operations, interspersed among the renaming declarations
6343 -- for the actuals) . We retrieve the corresponding actual by name
6344 -- because each actual has the same name as the formal, and they do
6345 -- appear in the same order.
6347 function Formal_Entity
6349 Act_Ent
: Entity_Id
) return Entity_Id
;
6350 -- Returns the entity associated with the given formal F. In the
6351 -- case where F is a formal package, this function will iterate
6352 -- through all of F's formals and enter map associations from the
6353 -- actuals occurring in the formal package's corresponding actual
6354 -- package (obtained via Act_Ent) to the formal package's formal
6355 -- parameters. This function is called recursively for arbitrary
6356 -- levels of formal packages.
6358 function Is_Instance_Of
6359 (Act_Spec
: Entity_Id
;
6360 Gen_Anc
: Entity_Id
) return Boolean;
6361 -- The actual can be an instantiation of a generic within another
6362 -- instance, in which case there is no direct link from it to the
6363 -- original generic ancestor. In that case, we recognize that the
6364 -- ultimate ancestor is the same by examining names and scopes.
6366 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
6367 -- Within the generic part, entities in the formal package are
6368 -- visible. To validate subsequent type declarations, indicate
6369 -- the correspondence betwen the entities in the analyzed formal,
6370 -- and the entities in the actual package. There are three packages
6371 -- involved in the instantiation of a formal package: the parent
6372 -- generic P1 which appears in the generic declaration, the fake
6373 -- instantiation P2 which appears in the analyzed generic, and whose
6374 -- visible entities may be used in subsequent formals, and the actual
6375 -- P3 in the instance. To validate subsequent formals, me indicate
6376 -- that the entities in P2 are mapped into those of P3. The mapping of
6377 -- entities has to be done recursively for nested packages.
6379 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
6380 -- If the current formal is declared with a box, its own formals are
6381 -- visible in the instance, as they were in the generic, and their
6382 -- Hidden flag must be reset. If some of these formals are themselves
6383 -- packages declared with a box, the processing must be recursive.
6385 --------------------------
6386 -- Find_Matching_Actual --
6387 --------------------------
6389 procedure Find_Matching_Actual
6391 Act
: in out Entity_Id
)
6393 Formal_Ent
: Entity_Id
;
6396 case Nkind
(Original_Node
(F
)) is
6397 when N_Formal_Object_Declaration |
6398 N_Formal_Type_Declaration
=>
6399 Formal_Ent
:= Defining_Identifier
(F
);
6401 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6405 when N_Formal_Subprogram_Declaration |
6406 N_Formal_Package_Declaration |
6407 N_Package_Declaration |
6408 N_Generic_Package_Declaration
=>
6409 Formal_Ent
:= Defining_Entity
(F
);
6411 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6416 raise Program_Error
;
6418 end Find_Matching_Actual
;
6424 function Formal_Entity
6426 Act_Ent
: Entity_Id
) return Entity_Id
6428 Orig_Node
: Node_Id
:= F
;
6429 Act_Pkg
: Entity_Id
;
6432 case Nkind
(Original_Node
(F
)) is
6433 when N_Formal_Object_Declaration
=>
6434 return Defining_Identifier
(F
);
6436 when N_Formal_Type_Declaration
=>
6437 return Defining_Identifier
(F
);
6439 when N_Formal_Subprogram_Declaration
=>
6440 return Defining_Unit_Name
(Specification
(F
));
6442 when N_Package_Declaration
=>
6443 return Defining_Unit_Name
(Specification
(F
));
6445 when N_Formal_Package_Declaration |
6446 N_Generic_Package_Declaration
=>
6448 if Nkind
(F
) = N_Generic_Package_Declaration
then
6449 Orig_Node
:= Original_Node
(F
);
6454 -- Find matching actual package, skipping over itypes and
6455 -- other entities generated when analyzing the formal. We
6456 -- know that if the instantiation is legal then there is
6457 -- a matching package for the formal.
6459 while Ekind
(Act_Pkg
) /= E_Package
loop
6460 Act_Pkg
:= Next_Entity
(Act_Pkg
);
6464 Actual_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
6465 Formal_Node
: Node_Id
;
6466 Formal_Ent
: Entity_Id
;
6468 Gen_Decl
: constant Node_Id
:=
6469 Unit_Declaration_Node
6470 (Entity
(Name
(Orig_Node
)));
6472 Formals
: constant List_Id
:=
6473 Generic_Formal_Declarations
(Gen_Decl
);
6476 if Present
(Formals
) then
6477 Formal_Node
:= First_Non_Pragma
(Formals
);
6479 Formal_Node
:= Empty
;
6482 while Present
(Actual_Ent
)
6483 and then Present
(Formal_Node
)
6484 and then Actual_Ent
/= First_Private_Entity
(Act_Ent
)
6486 -- ??? Are the following calls also needed here:
6488 -- Set_Is_Hidden (Actual_Ent, False);
6489 -- Set_Is_Potentially_Use_Visible
6490 -- (Actual_Ent, In_Use (Act_Ent));
6492 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6493 if Present
(Formal_Ent
) then
6494 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6496 Next_Non_Pragma
(Formal_Node
);
6498 Next_Entity
(Actual_Ent
);
6502 return Defining_Identifier
(Orig_Node
);
6504 when N_Use_Package_Clause
=>
6507 when N_Use_Type_Clause
=>
6510 -- We return Empty for all other encountered forms of
6511 -- declarations because there are some cases of nonformal
6512 -- sorts of declaration that can show up (e.g., when array
6513 -- formals are present). Since it's not clear what kinds
6514 -- can appear among the formals, we won't raise failure here.
6522 --------------------
6523 -- Is_Instance_Of --
6524 --------------------
6526 function Is_Instance_Of
6527 (Act_Spec
: Entity_Id
;
6528 Gen_Anc
: Entity_Id
) return Boolean
6530 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
6533 if No
(Gen_Par
) then
6536 -- Simplest case: the generic parent of the actual is the formal.
6538 elsif Gen_Par
= Gen_Anc
then
6541 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
6544 -- The actual may be obtained through several instantiations. Its
6545 -- scope must itself be an instance of a generic declared in the
6546 -- same scope as the formal. Any other case is detected above.
6548 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
6552 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
6560 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
6565 Set_Instance_Of
(Form
, Act
);
6567 -- Traverse formal and actual package to map the corresponding
6568 -- entities. We skip over internal entities that may be generated
6569 -- during semantic analysis, and find the matching entities by
6570 -- name, given that they must appear in the same order.
6572 E1
:= First_Entity
(Form
);
6573 E2
:= First_Entity
(Act
);
6575 and then E1
/= First_Private_Entity
(Form
)
6577 if not Is_Internal
(E1
)
6578 and then not Is_Class_Wide_Type
(E1
)
6579 and then Present
(Parent
(E1
))
6582 and then Chars
(E2
) /= Chars
(E1
)
6590 Set_Instance_Of
(E1
, E2
);
6593 and then Is_Tagged_Type
(E2
)
6596 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
6599 if Ekind
(E1
) = E_Package
6600 and then No
(Renamed_Object
(E1
))
6602 Map_Entities
(E1
, E2
);
6611 ---------------------------
6612 -- Process_Nested_Formal --
6613 ---------------------------
6615 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
6619 if Present
(Associated_Formal_Package
(Formal
))
6620 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
6622 Ent
:= First_Entity
(Formal
);
6623 while Present
(Ent
) loop
6624 Set_Is_Hidden
(Ent
, False);
6625 Set_Is_Potentially_Use_Visible
6626 (Ent
, Is_Potentially_Use_Visible
(Formal
));
6628 if Ekind
(Ent
) = E_Package
then
6629 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
6630 Process_Nested_Formal
(Ent
);
6636 end Process_Nested_Formal
;
6638 -- Start of processing for Instantiate_Formal_Package
6643 if not Is_Entity_Name
(Actual
)
6644 or else Ekind
(Entity
(Actual
)) /= E_Package
6647 ("expect package instance to instantiate formal", Actual
);
6648 Abandon_Instantiation
(Actual
);
6649 raise Program_Error
;
6652 Actual_Pack
:= Entity
(Actual
);
6653 Set_Is_Instantiated
(Actual_Pack
);
6655 -- The actual may be a renamed package, or an outer generic
6656 -- formal package whose instantiation is converted into a renaming.
6658 if Present
(Renamed_Object
(Actual_Pack
)) then
6659 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
6662 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
6663 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
6664 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
6667 Generic_Parent
(Specification
(Analyzed_Formal
));
6669 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6672 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
6673 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
6675 Parent_Spec
:= Parent
(Actual_Pack
);
6678 if Gen_Parent
= Any_Id
then
6680 ("previous error in declaration of formal package", Actual
);
6681 Abandon_Instantiation
(Actual
);
6684 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
6690 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
6691 Abandon_Instantiation
(Actual
);
6694 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
6695 Map_Entities
(Formal_Pack
, Actual_Pack
);
6698 Make_Package_Renaming_Declaration
(Loc
,
6699 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
6700 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
6702 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
6703 Defining_Identifier
(Formal
));
6704 Decls
:= New_List
(Nod
);
6706 -- If the formal F has a box, then the generic declarations are
6707 -- visible in the generic G. In an instance of G, the corresponding
6708 -- entities in the actual for F (which are the actuals for the
6709 -- instantiation of the generic that F denotes) must also be made
6710 -- visible for analysis of the current instance. On exit from the
6711 -- current instance, those entities are made private again. If the
6712 -- actual is currently in use, these entities are also use-visible.
6714 -- The loop through the actual entities also steps through the
6715 -- formal entities and enters associations from formals to
6716 -- actuals into the renaming map. This is necessary to properly
6717 -- handle checking of actual parameter associations for later
6718 -- formals that depend on actuals declared in the formal package.
6720 if Box_Present
(Formal
) then
6722 Gen_Decl
: constant Node_Id
:=
6723 Unit_Declaration_Node
(Gen_Parent
);
6724 Formals
: constant List_Id
:=
6725 Generic_Formal_Declarations
(Gen_Decl
);
6726 Actual_Ent
: Entity_Id
;
6727 Formal_Node
: Node_Id
;
6728 Formal_Ent
: Entity_Id
;
6731 if Present
(Formals
) then
6732 Formal_Node
:= First_Non_Pragma
(Formals
);
6734 Formal_Node
:= Empty
;
6737 Actual_Ent
:= First_Entity
(Actual_Pack
);
6739 while Present
(Actual_Ent
)
6740 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
6742 Set_Is_Hidden
(Actual_Ent
, False);
6743 Set_Is_Potentially_Use_Visible
6744 (Actual_Ent
, In_Use
(Actual_Pack
));
6746 if Ekind
(Actual_Ent
) = E_Package
then
6747 Process_Nested_Formal
(Actual_Ent
);
6750 if Present
(Formal_Node
) then
6751 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6753 if Present
(Formal_Ent
) then
6754 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
6755 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6758 Next_Non_Pragma
(Formal_Node
);
6761 -- No further formals to match, but the generic
6762 -- part may contain inherited operation that are
6763 -- not hidden in the enclosing instance.
6765 Next_Entity
(Actual_Ent
);
6771 -- If the formal is not declared with a box, reanalyze it as
6772 -- an instantiation, to verify the matching rules of 12.7. The
6773 -- actual checks are performed after the generic associations
6778 I_Pack
: constant Entity_Id
:=
6779 Make_Defining_Identifier
(Sloc
(Actual
),
6780 Chars
=> New_Internal_Name
('P'));
6783 Set_Is_Internal
(I_Pack
);
6786 Make_Package_Instantiation
(Sloc
(Actual
),
6787 Defining_Unit_Name
=> I_Pack
,
6788 Name
=> New_Occurrence_Of
(Gen_Parent
, Sloc
(Actual
)),
6789 Generic_Associations
=>
6790 Generic_Associations
(Formal
)));
6796 end Instantiate_Formal_Package
;
6798 -----------------------------------
6799 -- Instantiate_Formal_Subprogram --
6800 -----------------------------------
6802 function Instantiate_Formal_Subprogram
6805 Analyzed_Formal
: Node_Id
) return Node_Id
6807 Loc
: Source_Ptr
:= Sloc
(Instantiation_Node
);
6808 Formal_Sub
: constant Entity_Id
:=
6809 Defining_Unit_Name
(Specification
(Formal
));
6810 Analyzed_S
: constant Entity_Id
:=
6811 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6812 Decl_Node
: Node_Id
;
6816 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
6817 -- If the generic is a child unit, the parent has been installed
6818 -- on the scope stack, but a default subprogram cannot resolve to
6819 -- something on the parent because that parent is not really part
6820 -- of the visible context (it is there to resolve explicit local
6821 -- entities). If the default has resolved in this way, we remove
6822 -- the entity from immediate visibility and analyze the node again
6823 -- to emit an error message or find another visible candidate.
6825 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
6826 -- Perform legality check and raise exception on failure.
6828 -----------------------
6829 -- From_Parent_Scope --
6830 -----------------------
6832 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
6833 Gen_Scope
: Node_Id
:= Scope
(Analyzed_S
);
6836 while Present
(Gen_Scope
)
6837 and then Is_Child_Unit
(Gen_Scope
)
6839 if Scope
(Subp
) = Scope
(Gen_Scope
) then
6843 Gen_Scope
:= Scope
(Gen_Scope
);
6847 end From_Parent_Scope
;
6849 -----------------------------
6850 -- Valid_Actual_Subprogram --
6851 -----------------------------
6853 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
6854 Act_E
: Entity_Id
:= Empty
;
6857 if Is_Entity_Name
(Act
) then
6858 Act_E
:= Entity
(Act
);
6859 elsif Nkind
(Act
) = N_Selected_Component
6860 and then Is_Entity_Name
(Selector_Name
(Act
))
6862 Act_E
:= Entity
(Selector_Name
(Act
));
6865 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
6866 or else Nkind
(Act
) = N_Attribute_Reference
6867 or else Nkind
(Act
) = N_Indexed_Component
6868 or else Nkind
(Act
) = N_Character_Literal
6869 or else Nkind
(Act
) = N_Explicit_Dereference
6875 ("expect subprogram or entry name in instantiation of&",
6876 Instantiation_Node
, Formal_Sub
);
6877 Abandon_Instantiation
(Instantiation_Node
);
6879 end Valid_Actual_Subprogram
;
6881 -- Start of processing for Instantiate_Formal_Subprogram
6884 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
6886 -- Create new entity for the actual (New_Copy_Tree does not).
6888 Set_Defining_Unit_Name
6889 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6891 -- Find entity of actual. If the actual is an attribute reference, it
6892 -- cannot be resolved here (its formal is missing) but is handled
6893 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6894 -- fully resolved subsequently, when the renaming declaration for the
6895 -- formal is analyzed. If it is an explicit dereference, resolve the
6896 -- prefix but not the actual itself, to prevent interpretation as a
6899 if Present
(Actual
) then
6900 Loc
:= Sloc
(Actual
);
6901 Set_Sloc
(New_Spec
, Loc
);
6903 if Nkind
(Actual
) = N_Operator_Symbol
then
6904 Find_Direct_Name
(Actual
);
6906 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
6907 Analyze
(Prefix
(Actual
));
6909 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
6913 Valid_Actual_Subprogram
(Actual
);
6916 elsif Present
(Default_Name
(Formal
)) then
6917 if Nkind
(Default_Name
(Formal
)) /= N_Attribute_Reference
6918 and then Nkind
(Default_Name
(Formal
)) /= N_Selected_Component
6919 and then Nkind
(Default_Name
(Formal
)) /= N_Indexed_Component
6920 and then Nkind
(Default_Name
(Formal
)) /= N_Character_Literal
6921 and then Present
(Entity
(Default_Name
(Formal
)))
6923 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
6925 Nam
:= New_Copy
(Default_Name
(Formal
));
6926 Set_Sloc
(Nam
, Loc
);
6929 elsif Box_Present
(Formal
) then
6931 -- Actual is resolved at the point of instantiation. Create
6932 -- an identifier or operator with the same name as the formal.
6934 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
6935 Nam
:= Make_Operator_Symbol
(Loc
,
6936 Chars
=> Chars
(Formal_Sub
),
6937 Strval
=> No_String
);
6939 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
6943 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
6945 ("missing actual&", Instantiation_Node
, Formal_Sub
);
6947 ("\in instantiation of & declared#",
6948 Instantiation_Node
, Scope
(Analyzed_S
));
6949 Abandon_Instantiation
(Instantiation_Node
);
6953 Make_Subprogram_Renaming_Declaration
(Loc
,
6954 Specification
=> New_Spec
,
6957 -- If we do not have an actual and the formal specified <> then
6958 -- set to get proper default.
6960 if No
(Actual
) and then Box_Present
(Formal
) then
6961 Set_From_Default
(Decl_Node
);
6964 -- Gather possible interpretations for the actual before analyzing the
6965 -- instance. If overloaded, it will be resolved when analyzing the
6966 -- renaming declaration.
6968 if Box_Present
(Formal
)
6969 and then No
(Actual
)
6973 if Is_Child_Unit
(Scope
(Analyzed_S
))
6974 and then Present
(Entity
(Nam
))
6976 if not Is_Overloaded
(Nam
) then
6978 if From_Parent_Scope
(Entity
(Nam
)) then
6979 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
6980 Set_Entity
(Nam
, Empty
);
6981 Set_Etype
(Nam
, Empty
);
6985 Set_Is_Immediately_Visible
(Entity
(Nam
));
6994 Get_First_Interp
(Nam
, I
, It
);
6996 while Present
(It
.Nam
) loop
6997 if From_Parent_Scope
(It
.Nam
) then
7001 Get_Next_Interp
(I
, It
);
7008 -- The generic instantiation freezes the actual. This can only be
7009 -- done once the actual is resolved, in the analysis of the renaming
7010 -- declaration. To make the formal subprogram entity available, we set
7011 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7012 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7013 -- of formal abstract subprograms.
7015 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
7017 -- We cannot analyze the renaming declaration, and thus find the
7018 -- actual, until the all the actuals are assembled in the instance.
7019 -- For subsequent checks of other actuals, indicate the node that
7020 -- will hold the instance of this formal.
7022 Set_Instance_Of
(Analyzed_S
, Nam
);
7024 if Nkind
(Actual
) = N_Selected_Component
7025 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
7026 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
7028 -- The renaming declaration will create a body, which must appear
7029 -- outside of the instantiation, We move the renaming declaration
7030 -- out of the instance, and create an additional renaming inside,
7031 -- to prevent freezing anomalies.
7034 Anon_Id
: constant Entity_Id
:=
7035 Make_Defining_Identifier
7036 (Loc
, New_Internal_Name
('E'));
7038 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
7039 Insert_Before
(Instantiation_Node
, Decl_Node
);
7040 Analyze
(Decl_Node
);
7042 -- Now create renaming within the instance
7045 Make_Subprogram_Renaming_Declaration
(Loc
,
7046 Specification
=> New_Copy_Tree
(New_Spec
),
7047 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7049 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
7050 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7055 end Instantiate_Formal_Subprogram
;
7057 ------------------------
7058 -- Instantiate_Object --
7059 ------------------------
7061 function Instantiate_Object
7064 Analyzed_Formal
: Node_Id
) return List_Id
7066 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7067 Type_Id
: constant Node_Id
:= Subtype_Mark
(Formal
);
7068 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7069 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
7070 Orig_Ftyp
: constant Entity_Id
:=
7071 Etype
(Defining_Identifier
(Analyzed_Formal
));
7072 List
: constant List_Id
:= New_List
;
7074 Decl_Node
: Node_Id
;
7075 Subt_Decl
: Node_Id
:= Empty
;
7078 -- Sloc for error message on missing actual.
7079 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
7081 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
7082 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
7085 Set_Parent
(List
, Parent
(Actual
));
7089 if Out_Present
(Formal
) then
7091 -- An IN OUT generic actual must be a name. The instantiation is
7092 -- a renaming declaration. The actual is the name being renamed.
7093 -- We use the actual directly, rather than a copy, because it is not
7094 -- used further in the list of actuals, and because a copy or a use
7095 -- of relocate_node is incorrect if the instance is nested within
7096 -- a generic. In order to simplify ASIS searches, the Generic_Parent
7097 -- field links the declaration to the generic association.
7102 Instantiation_Node
, Formal_Id
);
7104 ("\in instantiation of & declared#",
7106 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7107 Abandon_Instantiation
(Instantiation_Node
);
7111 Make_Object_Renaming_Declaration
(Loc
,
7112 Defining_Identifier
=> New_Copy
(Formal_Id
),
7113 Subtype_Mark
=> New_Copy_Tree
(Type_Id
),
7116 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7118 -- The analysis of the actual may produce insert_action nodes, so
7119 -- the declaration must have a context in which to attach them.
7121 Append
(Decl_Node
, List
);
7124 -- This check is performed here because Analyze_Object_Renaming
7125 -- will not check it when Comes_From_Source is False. Note
7126 -- though that the check for the actual being the name of an
7127 -- object will be performed in Analyze_Object_Renaming.
7129 if Is_Object_Reference
(Actual
)
7130 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
7133 ("illegal discriminant-dependent component for in out parameter",
7137 -- The actual has to be resolved in order to check that it is
7138 -- a variable (due to cases such as F(1), where F returns
7139 -- access to an array, and for overloaded prefixes).
7142 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
7144 if Is_Private_Type
(Ftyp
)
7145 and then not Is_Private_Type
(Etype
(Actual
))
7146 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
7147 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
7149 -- If the actual has the type of the full view of the formal,
7150 -- or else a non-private subtype of the formal, then
7151 -- the visibility of the formal type has changed. Add to the
7152 -- actuals a subtype declaration that will force the exchange
7153 -- of views in the body of the instance as well.
7156 Make_Subtype_Declaration
(Loc
,
7157 Defining_Identifier
=>
7158 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
7159 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
7161 Prepend
(Subt_Decl
, List
);
7163 Append_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
7164 Exchange_Declarations
(Ftyp
);
7167 Resolve
(Actual
, Ftyp
);
7169 if not Is_Variable
(Actual
) or else Paren_Count
(Actual
) > 0 then
7171 ("actual for& must be a variable", Actual
, Formal_Id
);
7173 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
7175 "type of actual does not match type of&", Actual
, Formal_Id
);
7179 Note_Possible_Modification
(Actual
);
7181 -- Check for instantiation of atomic/volatile actual for
7182 -- non-atomic/volatile formal (RM C.6 (12)).
7184 if Is_Atomic_Object
(Actual
)
7185 and then not Is_Atomic
(Orig_Ftyp
)
7188 ("cannot instantiate non-atomic formal object " &
7189 "with atomic actual", Actual
);
7191 elsif Is_Volatile_Object
(Actual
)
7192 and then not Is_Volatile
(Orig_Ftyp
)
7195 ("cannot instantiate non-volatile formal object " &
7196 "with volatile actual", Actual
);
7202 -- The instantiation of a generic formal in-parameter
7203 -- is a constant declaration. The actual is the expression for
7204 -- that declaration.
7206 if Present
(Actual
) then
7208 Decl_Node
:= Make_Object_Declaration
(Loc
,
7209 Defining_Identifier
=> New_Copy
(Formal_Id
),
7210 Constant_Present
=> True,
7211 Object_Definition
=> New_Copy_Tree
(Type_Id
),
7212 Expression
=> Actual
);
7214 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7216 -- A generic formal object of a tagged type is defined
7217 -- to be aliased so the new constant must also be treated
7221 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7223 Set_Aliased_Present
(Decl_Node
);
7226 Append
(Decl_Node
, List
);
7228 -- No need to repeat (pre-)analysis of some expression nodes
7229 -- already handled in Pre_Analyze_Actuals.
7231 if Nkind
(Actual
) /= N_Allocator
then
7236 Typ
: constant Entity_Id
:=
7238 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
7241 Freeze_Before
(Instantiation_Node
, Typ
);
7243 -- If the actual is an aggregate, perform name resolution
7244 -- on its components (the analysis of an aggregate does not
7245 -- do it) to capture local names that may be hidden if the
7246 -- generic is a child unit.
7248 if Nkind
(Actual
) = N_Aggregate
then
7249 Pre_Analyze_And_Resolve
(Actual
, Typ
);
7253 elsif Present
(Expression
(Formal
)) then
7255 -- Use default to construct declaration.
7258 Make_Object_Declaration
(Sloc
(Formal
),
7259 Defining_Identifier
=> New_Copy
(Formal_Id
),
7260 Constant_Present
=> True,
7261 Object_Definition
=> New_Copy
(Type_Id
),
7262 Expression
=> New_Copy_Tree
(Expression
(Formal
)));
7264 Append
(Decl_Node
, List
);
7265 Set_Analyzed
(Expression
(Decl_Node
), False);
7270 Instantiation_Node
, Formal_Id
);
7271 Error_Msg_NE
("\in instantiation of & declared#",
7273 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7276 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7278 -- Create dummy constant declaration so that instance can
7279 -- be analyzed, to minimize cascaded visibility errors.
7282 Make_Object_Declaration
(Loc
,
7283 Defining_Identifier
=> New_Copy
(Formal_Id
),
7284 Constant_Present
=> True,
7285 Object_Definition
=> New_Copy
(Type_Id
),
7287 Make_Attribute_Reference
(Sloc
(Formal_Id
),
7288 Attribute_Name
=> Name_First
,
7289 Prefix
=> New_Copy
(Type_Id
)));
7291 Append
(Decl_Node
, List
);
7294 Abandon_Instantiation
(Instantiation_Node
);
7301 end Instantiate_Object
;
7303 ------------------------------
7304 -- Instantiate_Package_Body --
7305 ------------------------------
7307 procedure Instantiate_Package_Body
7308 (Body_Info
: Pending_Body_Info
;
7309 Inlined_Body
: Boolean := False)
7311 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7312 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7313 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7315 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7316 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7317 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7318 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
7319 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
7321 Act_Body_Name
: Node_Id
;
7323 Gen_Body_Id
: Node_Id
;
7325 Act_Body_Id
: Entity_Id
;
7327 Parent_Installed
: Boolean := False;
7328 Save_Style_Check
: constant Boolean := Style_Check
;
7331 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7333 -- The instance body may already have been processed, as the parent
7334 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7336 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
7340 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7342 if No
(Gen_Body_Id
) then
7343 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7344 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7347 -- Establish global variable for sloc adjustment and for error
7350 Instantiation_Node
:= Inst_Node
;
7352 if Present
(Gen_Body_Id
) then
7353 Save_Env
(Gen_Unit
, Act_Decl_Id
);
7354 Style_Check
:= False;
7355 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7357 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7359 Create_Instantiation_Source
7360 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
7364 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7366 -- Build new name (possibly qualified) for body declaration
7368 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
7370 -- Some attributes of the spec entity are not inherited by the
7373 Set_Handler_Records
(Act_Body_Id
, No_List
);
7375 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7376 N_Defining_Program_Unit_Name
7379 Make_Defining_Program_Unit_Name
(Loc
,
7380 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
7381 Defining_Identifier
=> Act_Body_Id
);
7383 Act_Body_Name
:= Act_Body_Id
;
7386 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
7388 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
7389 Check_Generic_Actuals
(Act_Decl_Id
, False);
7391 -- If it is a child unit, make the parent instance (which is an
7392 -- instance of the parent of the generic) visible. The parent
7393 -- instance is the prefix of the name of the generic unit.
7395 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7396 and then Nkind
(Gen_Id
) = N_Expanded_Name
7398 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7399 Parent_Installed
:= True;
7401 elsif Is_Child_Unit
(Gen_Unit
) then
7402 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7403 Parent_Installed
:= True;
7406 -- If the instantiation is a library unit, and this is the main
7407 -- unit, then build the resulting compilation unit nodes for the
7408 -- instance. If this is a compilation unit but it is not the main
7409 -- unit, then it is the body of a unit in the context, that is being
7410 -- compiled because it is encloses some inlined unit or another
7411 -- generic unit being instantiated. In that case, this body is not
7412 -- part of the current compilation, and is not attached to the tree,
7413 -- but its parent must be set for analysis.
7415 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7417 -- Replace instance node with body of instance, and create
7418 -- new node for corresponding instance declaration.
7420 Build_Instance_Compilation_Unit_Nodes
7421 (Inst_Node
, Act_Body
, Act_Decl
);
7422 Analyze
(Inst_Node
);
7424 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7426 -- If the instance is a child unit itself, then set the
7427 -- scope of the expanded body to be the parent of the
7428 -- instantiation (ensuring that the fully qualified name
7429 -- will be generated for the elaboration subprogram).
7431 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7432 N_Defining_Program_Unit_Name
7435 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
7439 -- Case where instantiation is not a library unit
7442 -- If this is an early instantiation, i.e. appears textually
7443 -- before the corresponding body and must be elaborated first,
7444 -- indicate that the body instance is to be delayed.
7446 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
7448 -- Now analyze the body. We turn off all checks if this is
7449 -- an internal unit, since there is no reason to have checks
7450 -- on for any predefined run-time library code. All such
7451 -- code is designed to be compiled with checks off.
7453 -- Note that we do NOT apply this criterion to children of
7454 -- GNAT (or on VMS, children of DEC). The latter units must
7455 -- suppress checks explicitly if this is needed.
7457 if Is_Predefined_File_Name
7458 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
7460 Analyze
(Act_Body
, Suppress
=> All_Checks
);
7466 if not Generic_Separately_Compiled
(Gen_Unit
) then
7467 Inherit_Context
(Gen_Body
, Inst_Node
);
7470 -- Remove the parent instances if they have been placed on the
7471 -- scope stack to compile the body.
7473 if Parent_Installed
then
7474 Remove_Parent
(In_Body
=> True);
7477 Restore_Private_Views
(Act_Decl_Id
);
7479 -- Remove the current unit from visibility if this is an instance
7480 -- that is not elaborated on the fly for inlining purposes.
7482 if not Inlined_Body
then
7483 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
7487 Style_Check
:= Save_Style_Check
;
7489 -- If we have no body, and the unit requires a body, then complain.
7490 -- This complaint is suppressed if we have detected other errors
7491 -- (since a common reason for missing the body is that it had errors).
7493 elsif Unit_Requires_Body
(Gen_Unit
) then
7494 if Serious_Errors_Detected
= 0 then
7496 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
7498 -- Don't attempt to perform any cleanup actions if some other
7499 -- error was aready detected, since this can cause blowups.
7505 -- Case of package that does not need a body
7508 -- If the instantiation of the declaration is a library unit,
7509 -- rewrite the original package instantiation as a package
7510 -- declaration in the compilation unit node.
7512 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7513 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
7514 Rewrite
(Inst_Node
, Act_Decl
);
7516 -- Generate elaboration entity, in case spec has elaboration
7517 -- code. This cannot be done when the instance is analyzed,
7518 -- because it is not known yet whether the body exists.
7520 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
7521 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
7523 -- If the instantiation is not a library unit, then append the
7524 -- declaration to the list of implicitly generated entities.
7525 -- unless it is already a list member which means that it was
7526 -- already processed
7528 elsif not Is_List_Member
(Act_Decl
) then
7529 Mark_Rewrite_Insertion
(Act_Decl
);
7530 Insert_Before
(Inst_Node
, Act_Decl
);
7534 Expander_Mode_Restore
;
7535 end Instantiate_Package_Body
;
7537 ---------------------------------
7538 -- Instantiate_Subprogram_Body --
7539 ---------------------------------
7541 procedure Instantiate_Subprogram_Body
7542 (Body_Info
: Pending_Body_Info
)
7544 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7545 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7546 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7547 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7548 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7549 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7550 Anon_Id
: constant Entity_Id
:=
7551 Defining_Unit_Name
(Specification
(Act_Decl
));
7552 Pack_Id
: constant Entity_Id
:=
7553 Defining_Unit_Name
(Parent
(Act_Decl
));
7556 Gen_Body_Id
: Node_Id
;
7558 Act_Body_Id
: Entity_Id
;
7559 Pack_Body
: Node_Id
;
7560 Prev_Formal
: Entity_Id
;
7562 Unit_Renaming
: Node_Id
;
7564 Parent_Installed
: Boolean := False;
7565 Save_Style_Check
: constant Boolean := Style_Check
;
7568 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7570 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7572 if No
(Gen_Body_Id
) then
7573 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7574 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7577 Instantiation_Node
:= Inst_Node
;
7579 if Present
(Gen_Body_Id
) then
7580 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7582 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
7584 -- Either body is not present, or context is non-expanding, as
7585 -- when compiling a subunit. Mark the instance as completed, and
7586 -- diagnose a missing body when needed.
7589 and then Operating_Mode
= Generate_Code
7592 ("missing proper body for instantiation", Gen_Body
);
7595 Set_Has_Completion
(Anon_Id
);
7599 Save_Env
(Gen_Unit
, Anon_Id
);
7600 Style_Check
:= False;
7601 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7602 Create_Instantiation_Source
7610 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7611 Act_Body_Id
:= Defining_Entity
(Act_Body
);
7612 Set_Chars
(Act_Body_Id
, Chars
(Anon_Id
));
7613 Set_Sloc
(Act_Body_Id
, Sloc
(Defining_Entity
(Inst_Node
)));
7614 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
7615 Set_Has_Completion
(Anon_Id
);
7616 Check_Generic_Actuals
(Pack_Id
, False);
7618 -- If it is a child unit, make the parent instance (which is an
7619 -- instance of the parent of the generic) visible. The parent
7620 -- instance is the prefix of the name of the generic unit.
7622 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7623 and then Nkind
(Gen_Id
) = N_Expanded_Name
7625 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7626 Parent_Installed
:= True;
7628 elsif Is_Child_Unit
(Gen_Unit
) then
7629 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7630 Parent_Installed
:= True;
7633 -- Inside its body, a reference to the generic unit is a reference
7634 -- to the instance. The corresponding renaming is the first
7635 -- declaration in the body.
7638 Make_Subprogram_Renaming_Declaration
(Loc
,
7641 Specification
(Original_Node
(Gen_Body
)),
7643 Instantiating
=> True),
7644 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7646 -- If there is a formal subprogram with the same name as the
7647 -- unit itself, do not add this renaming declaration. This is
7648 -- a temporary fix for one ACVC test. ???
7650 Prev_Formal
:= First_Entity
(Pack_Id
);
7651 while Present
(Prev_Formal
) loop
7652 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
7653 and then Is_Overloadable
(Prev_Formal
)
7658 Next_Entity
(Prev_Formal
);
7661 if Present
(Prev_Formal
) then
7662 Decls
:= New_List
(Act_Body
);
7664 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
7667 -- The subprogram body is placed in the body of a dummy package
7668 -- body, whose spec contains the subprogram declaration as well
7669 -- as the renaming declarations for the generic parameters.
7671 Pack_Body
:= Make_Package_Body
(Loc
,
7672 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7673 Declarations
=> Decls
);
7675 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7677 -- If the instantiation is a library unit, then build resulting
7678 -- compilation unit nodes for the instance. The declaration of
7679 -- the enclosing package is the grandparent of the subprogram
7680 -- declaration. First replace the instantiation node as the unit
7681 -- of the corresponding compilation.
7683 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7684 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7685 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
7686 Build_Instance_Compilation_Unit_Nodes
7687 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
7688 Analyze
(Inst_Node
);
7690 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
7691 Analyze
(Pack_Body
);
7695 Insert_Before
(Inst_Node
, Pack_Body
);
7696 Mark_Rewrite_Insertion
(Pack_Body
);
7697 Analyze
(Pack_Body
);
7699 if Expander_Active
then
7700 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
7704 if not Generic_Separately_Compiled
(Gen_Unit
) then
7705 Inherit_Context
(Gen_Body
, Inst_Node
);
7708 Restore_Private_Views
(Pack_Id
, False);
7710 if Parent_Installed
then
7711 Remove_Parent
(In_Body
=> True);
7715 Style_Check
:= Save_Style_Check
;
7717 -- Body not found. Error was emitted already. If there were no
7718 -- previous errors, this may be an instance whose scope is a premature
7719 -- instance. In that case we must insure that the (legal) program does
7720 -- raise program error if executed. We generate a subprogram body for
7721 -- this purpose. See DEC ac30vso.
7723 elsif Serious_Errors_Detected
= 0
7724 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
7726 if Ekind
(Anon_Id
) = E_Procedure
then
7728 Make_Subprogram_Body
(Loc
,
7730 Make_Procedure_Specification
(Loc
,
7731 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7732 Parameter_Specifications
=>
7734 (Parameter_Specifications
(Parent
(Anon_Id
)))),
7736 Declarations
=> Empty_List
,
7737 Handled_Statement_Sequence
=>
7738 Make_Handled_Sequence_Of_Statements
(Loc
,
7741 Make_Raise_Program_Error
(Loc
,
7743 PE_Access_Before_Elaboration
))));
7747 Make_Raise_Program_Error
(Loc
,
7748 Reason
=> PE_Access_Before_Elaboration
);
7750 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
7751 Set_Analyzed
(Ret_Expr
);
7754 Make_Subprogram_Body
(Loc
,
7756 Make_Function_Specification
(Loc
,
7757 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7758 Parameter_Specifications
=>
7760 (Parameter_Specifications
(Parent
(Anon_Id
))),
7762 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
7764 Declarations
=> Empty_List
,
7765 Handled_Statement_Sequence
=>
7766 Make_Handled_Sequence_Of_Statements
(Loc
,
7768 New_List
(Make_Return_Statement
(Loc
, Ret_Expr
))));
7771 Pack_Body
:= Make_Package_Body
(Loc
,
7772 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7773 Declarations
=> New_List
(Act_Body
));
7775 Insert_After
(Inst_Node
, Pack_Body
);
7776 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7777 Analyze
(Pack_Body
);
7780 Expander_Mode_Restore
;
7781 end Instantiate_Subprogram_Body
;
7783 ----------------------
7784 -- Instantiate_Type --
7785 ----------------------
7787 function Instantiate_Type
7790 Analyzed_Formal
: Node_Id
;
7791 Actual_Decls
: List_Id
) return Node_Id
7793 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7794 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7795 A_Gen_T
: constant Entity_Id
:= Defining_Identifier
(Analyzed_Formal
);
7796 Ancestor
: Entity_Id
:= Empty
;
7797 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
7799 Decl_Node
: Node_Id
;
7801 procedure Validate_Array_Type_Instance
;
7802 procedure Validate_Access_Subprogram_Instance
;
7803 procedure Validate_Access_Type_Instance
;
7804 procedure Validate_Derived_Type_Instance
;
7805 procedure Validate_Private_Type_Instance
;
7806 -- These procedures perform validation tests for the named case
7808 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
7809 -- Check that base types are the same and that the subtypes match
7810 -- statically. Used in several of the above.
7812 --------------------
7813 -- Subtypes_Match --
7814 --------------------
7816 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
7817 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
7820 return (Base_Type
(T
) = Base_Type
(Act_T
)
7821 -- why is the and then commented out here???
7822 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7823 and then Subtypes_Statically_Match
(T
, Act_T
))
7825 or else (Is_Class_Wide_Type
(Gen_T
)
7826 and then Is_Class_Wide_Type
(Act_T
)
7829 Get_Instance_Of
(Root_Type
(Gen_T
)),
7830 Root_Type
(Act_T
)));
7833 -----------------------------------------
7834 -- Validate_Access_Subprogram_Instance --
7835 -----------------------------------------
7837 procedure Validate_Access_Subprogram_Instance
is
7839 if not Is_Access_Type
(Act_T
)
7840 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
7843 ("expect access type in instantiation of &", Actual
, Gen_T
);
7844 Abandon_Instantiation
(Actual
);
7847 Check_Mode_Conformant
7848 (Designated_Type
(Act_T
),
7849 Designated_Type
(A_Gen_T
),
7853 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
7854 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
7856 ("protected access type not allowed for formal &",
7860 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
7862 ("expect protected access type for formal &",
7865 end Validate_Access_Subprogram_Instance
;
7867 -----------------------------------
7868 -- Validate_Access_Type_Instance --
7869 -----------------------------------
7871 procedure Validate_Access_Type_Instance
is
7872 Desig_Type
: constant Entity_Id
:=
7874 (Designated_Type
(A_Gen_T
), Scope
(A_Gen_T
));
7877 if not Is_Access_Type
(Act_T
) then
7879 ("expect access type in instantiation of &", Actual
, Gen_T
);
7880 Abandon_Instantiation
(Actual
);
7883 if Is_Access_Constant
(A_Gen_T
) then
7884 if not Is_Access_Constant
(Act_T
) then
7886 ("actual type must be access-to-constant type", Actual
);
7887 Abandon_Instantiation
(Actual
);
7890 if Is_Access_Constant
(Act_T
) then
7892 ("actual type must be access-to-variable type", Actual
);
7893 Abandon_Instantiation
(Actual
);
7895 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
7896 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
7898 Error_Msg_N
("actual must be general access type!", Actual
);
7899 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
7900 Abandon_Instantiation
(Actual
);
7904 -- The designated subtypes, that is to say the subtypes introduced
7905 -- by an access type declaration (and not by a subtype declaration)
7908 if not Subtypes_Match
7909 (Desig_Type
, Designated_Type
(Base_Type
(Act_T
)))
7912 ("designated type of actual does not match that of formal &",
7914 Abandon_Instantiation
(Actual
);
7916 elsif Is_Access_Type
(Designated_Type
(Act_T
))
7917 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
7919 Is_Constrained
(Designated_Type
(Desig_Type
))
7922 ("designated type of actual does not match that of formal &",
7924 Abandon_Instantiation
(Actual
);
7926 end Validate_Access_Type_Instance
;
7928 ----------------------------------
7929 -- Validate_Array_Type_Instance --
7930 ----------------------------------
7932 procedure Validate_Array_Type_Instance
is
7937 function Formal_Dimensions
return Int
;
7938 -- Count number of dimensions in array type formal
7940 -----------------------
7941 -- Formal_Dimensions --
7942 -----------------------
7944 function Formal_Dimensions
return Int
is
7949 if Nkind
(Def
) = N_Constrained_Array_Definition
then
7950 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
7952 Index
:= First
(Subtype_Marks
(Def
));
7955 while Present
(Index
) loop
7961 end Formal_Dimensions
;
7963 -- Start of processing for Validate_Array_Type_Instance
7966 if not Is_Array_Type
(Act_T
) then
7968 ("expect array type in instantiation of &", Actual
, Gen_T
);
7969 Abandon_Instantiation
(Actual
);
7971 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
7972 if not (Is_Constrained
(Act_T
)) then
7974 ("expect constrained array in instantiation of &",
7976 Abandon_Instantiation
(Actual
);
7980 if Is_Constrained
(Act_T
) then
7982 ("expect unconstrained array in instantiation of &",
7984 Abandon_Instantiation
(Actual
);
7988 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
7990 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
7991 Abandon_Instantiation
(Actual
);
7994 I1
:= First_Index
(A_Gen_T
);
7995 I2
:= First_Index
(Act_T
);
7996 for J
in 1 .. Formal_Dimensions
loop
7998 -- If the indices of the actual were given by a subtype_mark,
7999 -- the index was transformed into a range attribute. Retrieve
8000 -- the original type mark for checking.
8002 if Is_Entity_Name
(Original_Node
(I2
)) then
8003 T2
:= Entity
(Original_Node
(I2
));
8008 if not Subtypes_Match
8009 (Find_Actual_Type
(Etype
(I1
), Scope
(A_Gen_T
)), T2
)
8012 ("index types of actual do not match those of formal &",
8014 Abandon_Instantiation
(Actual
);
8021 if not Subtypes_Match
(
8022 Find_Actual_Type
(Component_Type
(A_Gen_T
), Scope
(A_Gen_T
)),
8023 Component_Type
(Act_T
))
8026 ("component subtype of actual does not match that of formal &",
8028 Abandon_Instantiation
(Actual
);
8031 if Has_Aliased_Components
(A_Gen_T
)
8032 and then not Has_Aliased_Components
(Act_T
)
8035 ("actual must have aliased components to match formal type &",
8039 end Validate_Array_Type_Instance
;
8041 ------------------------------------
8042 -- Validate_Derived_Type_Instance --
8043 ------------------------------------
8045 procedure Validate_Derived_Type_Instance
is
8046 Actual_Discr
: Entity_Id
;
8047 Ancestor_Discr
: Entity_Id
;
8050 -- If the parent type in the generic declaration is itself
8051 -- a previous formal type, then it is local to the generic
8052 -- and absent from the analyzed generic definition. In that
8053 -- case the ancestor is the instance of the formal (which must
8054 -- have been instantiated previously), unless the ancestor is
8055 -- itself a formal derived type. In this latter case (which is the
8056 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8057 -- formals is the ancestor of its parent. Otherwise, the analyzed
8058 -- generic carries the parent type. If the parent type is defined
8059 -- in a previous formal package, then the scope of that formal
8060 -- package is that of the generic type itself, and it has already
8061 -- been mapped into the corresponding type in the actual package.
8063 -- Common case: parent type defined outside of the generic
8065 if Is_Entity_Name
(Subtype_Mark
(Def
))
8066 and then Present
(Entity
(Subtype_Mark
(Def
)))
8068 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
8070 -- Check whether parent is defined in a previous formal package
8073 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
8076 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
8078 -- The type may be a local derivation, or a type extension of
8079 -- a previous formal, or of a formal of a parent package.
8081 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
8083 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
8085 -- Check whether the parent is another derived formal type
8086 -- in the same generic unit.
8088 if Etype
(A_Gen_T
) /= A_Gen_T
8089 and then Is_Generic_Type
(Etype
(A_Gen_T
))
8090 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
8091 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
8093 -- Locate ancestor of parent from the subtype declaration
8094 -- created for the actual.
8100 Decl
:= First
(Actual_Decls
);
8101 while Present
(Decl
) loop
8102 if Nkind
(Decl
) = N_Subtype_Declaration
8103 and then Chars
(Defining_Identifier
(Decl
)) =
8104 Chars
(Etype
(A_Gen_T
))
8106 Ancestor
:= Generic_Parent_Type
(Decl
);
8114 pragma Assert
(Present
(Ancestor
));
8118 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
8122 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
8125 if not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
8127 ("expect type derived from & in instantiation",
8128 Actual
, First_Subtype
(Ancestor
));
8129 Abandon_Instantiation
(Actual
);
8132 -- Perform atomic/volatile checks (RM C.6(12))
8134 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
8136 ("cannot have atomic actual type for non-atomic formal type",
8139 elsif Is_Volatile
(Act_T
)
8140 and then not Is_Volatile
(Ancestor
)
8141 and then Is_By_Reference_Type
(Ancestor
)
8144 ("cannot have volatile actual type for non-volatile formal type",
8148 -- It should not be necessary to check for unknown discriminants
8149 -- on Formal, but for some reason Has_Unknown_Discriminants is
8150 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8151 -- returns False. This needs fixing. ???
8153 if not Is_Indefinite_Subtype
(A_Gen_T
)
8154 and then not Unknown_Discriminants_Present
(Formal
)
8155 and then Is_Indefinite_Subtype
(Act_T
)
8158 ("actual subtype must be constrained", Actual
);
8159 Abandon_Instantiation
(Actual
);
8162 if not Unknown_Discriminants_Present
(Formal
) then
8163 if Is_Constrained
(Ancestor
) then
8164 if not Is_Constrained
(Act_T
) then
8166 ("actual subtype must be constrained", Actual
);
8167 Abandon_Instantiation
(Actual
);
8170 -- Ancestor is unconstrained
8172 elsif Is_Constrained
(Act_T
) then
8173 if Ekind
(Ancestor
) = E_Access_Type
8174 or else Is_Composite_Type
(Ancestor
)
8177 ("actual subtype must be unconstrained", Actual
);
8178 Abandon_Instantiation
(Actual
);
8181 -- A class-wide type is only allowed if the formal has
8182 -- unknown discriminants.
8184 elsif Is_Class_Wide_Type
(Act_T
)
8185 and then not Has_Unknown_Discriminants
(Ancestor
)
8188 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
8189 Abandon_Instantiation
(Actual
);
8191 -- Otherwise, the formal and actual shall have the same
8192 -- number of discriminants and each discriminant of the
8193 -- actual must correspond to a discriminant of the formal.
8195 elsif Has_Discriminants
(Act_T
)
8196 and then not Has_Unknown_Discriminants
(Act_T
)
8197 and then Has_Discriminants
(Ancestor
)
8199 Actual_Discr
:= First_Discriminant
(Act_T
);
8200 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
8201 while Present
(Actual_Discr
)
8202 and then Present
(Ancestor_Discr
)
8204 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
8205 not Present
(Corresponding_Discriminant
(Actual_Discr
))
8208 ("discriminant & does not correspond " &
8209 "to ancestor discriminant", Actual
, Actual_Discr
);
8210 Abandon_Instantiation
(Actual
);
8213 Next_Discriminant
(Actual_Discr
);
8214 Next_Discriminant
(Ancestor_Discr
);
8217 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
8219 ("actual for & must have same number of discriminants",
8221 Abandon_Instantiation
(Actual
);
8224 -- This case should be caught by the earlier check for
8225 -- for constrainedness, but the check here is added for
8228 elsif Has_Discriminants
(Act_T
)
8229 and then not Has_Unknown_Discriminants
(Act_T
)
8232 ("actual for & must not have discriminants", Actual
, Gen_T
);
8233 Abandon_Instantiation
(Actual
);
8235 elsif Has_Discriminants
(Ancestor
) then
8237 ("actual for & must have known discriminants", Actual
, Gen_T
);
8238 Abandon_Instantiation
(Actual
);
8241 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
8243 ("constraint on actual is incompatible with formal", Actual
);
8244 Abandon_Instantiation
(Actual
);
8247 end Validate_Derived_Type_Instance
;
8249 ------------------------------------
8250 -- Validate_Private_Type_Instance --
8251 ------------------------------------
8253 procedure Validate_Private_Type_Instance
is
8254 Formal_Discr
: Entity_Id
;
8255 Actual_Discr
: Entity_Id
;
8256 Formal_Subt
: Entity_Id
;
8259 if Is_Limited_Type
(Act_T
)
8260 and then not Is_Limited_Type
(A_Gen_T
)
8263 ("actual for non-limited & cannot be a limited type", Actual
,
8265 Explain_Limited_Type
(Act_T
, Actual
);
8266 Abandon_Instantiation
(Actual
);
8268 elsif Is_Indefinite_Subtype
(Act_T
)
8269 and then not Is_Indefinite_Subtype
(A_Gen_T
)
8270 and then Ada_Version
>= Ada_95
8273 ("actual for & must be a definite subtype", Actual
, Gen_T
);
8275 elsif not Is_Tagged_Type
(Act_T
)
8276 and then Is_Tagged_Type
(A_Gen_T
)
8279 ("actual for & must be a tagged type", Actual
, Gen_T
);
8281 elsif Has_Discriminants
(A_Gen_T
) then
8282 if not Has_Discriminants
(Act_T
) then
8284 ("actual for & must have discriminants", Actual
, Gen_T
);
8285 Abandon_Instantiation
(Actual
);
8287 elsif Is_Constrained
(Act_T
) then
8289 ("actual for & must be unconstrained", Actual
, Gen_T
);
8290 Abandon_Instantiation
(Actual
);
8293 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
8294 Actual_Discr
:= First_Discriminant
(Act_T
);
8295 while Formal_Discr
/= Empty
loop
8296 if Actual_Discr
= Empty
then
8298 ("discriminants on actual do not match formal",
8300 Abandon_Instantiation
(Actual
);
8303 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
8305 -- access discriminants match if designated types do.
8307 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
8308 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
))))
8309 = E_Anonymous_Access_Type
8310 and then Get_Instance_Of
(
8311 Designated_Type
(Base_Type
(Formal_Subt
)))
8312 = Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
8316 elsif Base_Type
(Formal_Subt
) /=
8317 Base_Type
(Etype
(Actual_Discr
))
8320 ("types of actual discriminants must match formal",
8322 Abandon_Instantiation
(Actual
);
8324 elsif not Subtypes_Statically_Match
8325 (Formal_Subt
, Etype
(Actual_Discr
))
8326 and then Ada_Version
>= Ada_95
8329 ("subtypes of actual discriminants must match formal",
8331 Abandon_Instantiation
(Actual
);
8334 Next_Discriminant
(Formal_Discr
);
8335 Next_Discriminant
(Actual_Discr
);
8338 if Actual_Discr
/= Empty
then
8340 ("discriminants on actual do not match formal",
8342 Abandon_Instantiation
(Actual
);
8349 end Validate_Private_Type_Instance
;
8351 -- Start of processing for Instantiate_Type
8354 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
8355 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
8358 elsif not Is_Entity_Name
(Actual
)
8359 or else not Is_Type
(Entity
(Actual
))
8362 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
8363 Abandon_Instantiation
(Actual
);
8366 Act_T
:= Entity
(Actual
);
8368 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8369 -- as a generic actual parameter if the corresponding formal type
8370 -- does not have a known_discriminant_part, or is a formal derived
8371 -- type that is an Unchecked_Union type.
8373 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
8374 if not Has_Discriminants
(A_Gen_T
)
8376 (Is_Derived_Type
(A_Gen_T
)
8378 Is_Unchecked_Union
(A_Gen_T
))
8382 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
8383 " discriminated formal type", Act_T
);
8388 -- Deal with fixed/floating restrictions
8390 if Is_Floating_Point_Type
(Act_T
) then
8391 Check_Restriction
(No_Floating_Point
, Actual
);
8392 elsif Is_Fixed_Point_Type
(Act_T
) then
8393 Check_Restriction
(No_Fixed_Point
, Actual
);
8396 -- Deal with error of using incomplete type as generic actual
8398 if Ekind
(Act_T
) = E_Incomplete_Type
then
8399 if No
(Underlying_Type
(Act_T
)) then
8400 Error_Msg_N
("premature use of incomplete type", Actual
);
8401 Abandon_Instantiation
(Actual
);
8403 Act_T
:= Full_View
(Act_T
);
8404 Set_Entity
(Actual
, Act_T
);
8406 if Has_Private_Component
(Act_T
) then
8408 ("premature use of type with private component", Actual
);
8412 -- Deal with error of premature use of private type as generic actual
8414 elsif Is_Private_Type
(Act_T
)
8415 and then Is_Private_Type
(Base_Type
(Act_T
))
8416 and then not Is_Generic_Type
(Act_T
)
8417 and then not Is_Derived_Type
(Act_T
)
8418 and then No
(Full_View
(Root_Type
(Act_T
)))
8420 Error_Msg_N
("premature use of private type", Actual
);
8422 elsif Has_Private_Component
(Act_T
) then
8424 ("premature use of type with private component", Actual
);
8427 Set_Instance_Of
(A_Gen_T
, Act_T
);
8429 -- If the type is generic, the class-wide type may also be used
8431 if Is_Tagged_Type
(A_Gen_T
)
8432 and then Is_Tagged_Type
(Act_T
)
8433 and then not Is_Class_Wide_Type
(A_Gen_T
)
8435 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
8436 Class_Wide_Type
(Act_T
));
8439 if not Is_Abstract
(A_Gen_T
)
8440 and then Is_Abstract
(Act_T
)
8443 ("actual of non-abstract formal cannot be abstract", Actual
);
8446 if Is_Scalar_Type
(Gen_T
) then
8447 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
8452 when N_Formal_Private_Type_Definition
=>
8453 Validate_Private_Type_Instance
;
8455 when N_Formal_Derived_Type_Definition
=>
8456 Validate_Derived_Type_Instance
;
8458 when N_Formal_Discrete_Type_Definition
=>
8459 if not Is_Discrete_Type
(Act_T
) then
8461 ("expect discrete type in instantiation of&", Actual
, Gen_T
);
8462 Abandon_Instantiation
(Actual
);
8465 when N_Formal_Signed_Integer_Type_Definition
=>
8466 if not Is_Signed_Integer_Type
(Act_T
) then
8468 ("expect signed integer type in instantiation of&",
8470 Abandon_Instantiation
(Actual
);
8473 when N_Formal_Modular_Type_Definition
=>
8474 if not Is_Modular_Integer_Type
(Act_T
) then
8476 ("expect modular type in instantiation of &", Actual
, Gen_T
);
8477 Abandon_Instantiation
(Actual
);
8480 when N_Formal_Floating_Point_Definition
=>
8481 if not Is_Floating_Point_Type
(Act_T
) then
8483 ("expect float type in instantiation of &", Actual
, Gen_T
);
8484 Abandon_Instantiation
(Actual
);
8487 when N_Formal_Ordinary_Fixed_Point_Definition
=>
8488 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
8490 ("expect ordinary fixed point type in instantiation of &",
8492 Abandon_Instantiation
(Actual
);
8495 when N_Formal_Decimal_Fixed_Point_Definition
=>
8496 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
8498 ("expect decimal type in instantiation of &",
8500 Abandon_Instantiation
(Actual
);
8503 when N_Array_Type_Definition
=>
8504 Validate_Array_Type_Instance
;
8506 when N_Access_To_Object_Definition
=>
8507 Validate_Access_Type_Instance
;
8509 when N_Access_Function_Definition |
8510 N_Access_Procedure_Definition
=>
8511 Validate_Access_Subprogram_Instance
;
8514 raise Program_Error
;
8519 Make_Subtype_Declaration
(Loc
,
8520 Defining_Identifier
=> New_Copy
(Gen_T
),
8521 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
8523 if Is_Private_Type
(Act_T
) then
8524 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8526 elsif Is_Access_Type
(Act_T
)
8527 and then Is_Private_Type
(Designated_Type
(Act_T
))
8529 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8532 -- Flag actual derived types so their elaboration produces the
8533 -- appropriate renamings for the primitive operations of the ancestor.
8534 -- Flag actual for formal private types as well, to determine whether
8535 -- operations in the private part may override inherited operations.
8537 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
8538 or else Nkind
(Def
) = N_Formal_Private_Type_Definition
8540 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
8544 end Instantiate_Type
;
8546 ---------------------
8547 -- Is_In_Main_Unit --
8548 ---------------------
8550 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
8551 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
8552 Current_Unit
: Node_Id
;
8555 if Unum
= Main_Unit
then
8558 -- If the current unit is a subunit then it is either the main unit
8559 -- or is being compiled as part of the main unit.
8561 elsif Nkind
(N
) = N_Compilation_Unit
then
8562 return Nkind
(Unit
(N
)) = N_Subunit
;
8565 Current_Unit
:= Parent
(N
);
8566 while Present
(Current_Unit
)
8567 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8569 Current_Unit
:= Parent
(Current_Unit
);
8572 -- The instantiation node is in the main unit, or else the current
8573 -- node (perhaps as the result of nested instantiations) is in the
8574 -- main unit, or in the declaration of the main unit, which in this
8575 -- last case must be a body.
8577 return Unum
= Main_Unit
8578 or else Current_Unit
= Cunit
(Main_Unit
)
8579 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
8580 or else (Present
(Library_Unit
(Current_Unit
))
8581 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
8582 end Is_In_Main_Unit
;
8584 ----------------------------
8585 -- Load_Parent_Of_Generic --
8586 ----------------------------
8588 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
) is
8589 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
8590 Save_Style_Check
: constant Boolean := Style_Check
;
8591 True_Parent
: Node_Id
;
8592 Inst_Node
: Node_Id
;
8596 if not In_Same_Source_Unit
(N
, Spec
)
8597 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
8598 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
8599 and then not Is_In_Main_Unit
(Spec
))
8601 -- Find body of parent of spec, and analyze it. A special case
8602 -- arises when the parent is an instantiation, that is to say when
8603 -- we are currently instantiating a nested generic. In that case,
8604 -- there is no separate file for the body of the enclosing instance.
8605 -- Instead, the enclosing body must be instantiated as if it were
8606 -- a pending instantiation, in order to produce the body for the
8607 -- nested generic we require now. Note that in that case the
8608 -- generic may be defined in a package body, the instance defined
8609 -- in the same package body, and the original enclosing body may not
8610 -- be in the main unit.
8612 True_Parent
:= Parent
(Spec
);
8615 while Present
(True_Parent
)
8616 and then Nkind
(True_Parent
) /= N_Compilation_Unit
8618 if Nkind
(True_Parent
) = N_Package_Declaration
8620 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
8622 -- Parent is a compilation unit that is an instantiation.
8623 -- Instantiation node has been replaced with package decl.
8625 Inst_Node
:= Original_Node
(True_Parent
);
8628 elsif Nkind
(True_Parent
) = N_Package_Declaration
8629 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
8630 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
8632 -- Parent is an instantiation within another specification.
8633 -- Declaration for instance has been inserted before original
8634 -- instantiation node. A direct link would be preferable?
8636 Inst_Node
:= Next
(True_Parent
);
8638 while Present
(Inst_Node
)
8639 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
8644 -- If the instance appears within a generic, and the generic
8645 -- unit is defined within a formal package of the enclosing
8646 -- generic, there is no generic body available, and none
8647 -- needed. A more precise test should be used ???
8649 if No
(Inst_Node
) then
8655 True_Parent
:= Parent
(True_Parent
);
8659 -- Case where we are currently instantiating a nested generic
8661 if Present
(Inst_Node
) then
8662 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
8664 -- Instantiation node and declaration of instantiated package
8665 -- were exchanged when only the declaration was needed.
8666 -- Restore instantiation node before proceeding with body.
8668 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
8671 -- Now complete instantiation of enclosing body, if it appears
8672 -- in some other unit. If it appears in the current unit, the
8673 -- body will have been instantiated already.
8675 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8677 -- We need to determine the expander mode to instantiate
8678 -- the enclosing body. Because the generic body we need
8679 -- may use global entities declared in the enclosing package
8680 -- (including aggregates) it is in general necessary to
8681 -- compile this body with expansion enabled. The exception
8682 -- is if we are within a generic package, in which case
8683 -- the usual generic rule applies.
8686 Exp_Status
: Boolean := True;
8690 -- Loop through scopes looking for generic package
8692 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
8693 while Present
(Scop
)
8694 and then Scop
/= Standard_Standard
8696 if Ekind
(Scop
) = E_Generic_Package
then
8697 Exp_Status
:= False;
8701 Scop
:= Scope
(Scop
);
8704 Instantiate_Package_Body
8705 (Pending_Body_Info
'(
8706 Inst_Node, True_Parent, Exp_Status,
8707 Get_Code_Unit (Sloc (Inst_Node))));
8711 -- Case where we are not instantiating a nested generic
8714 Opt.Style_Check := False;
8715 Expander_Mode_Save_And_Set (True);
8716 Load_Needed_Body (Comp_Unit, OK);
8717 Opt.Style_Check := Save_Style_Check;
8718 Expander_Mode_Restore;
8721 and then Unit_Requires_Body (Defining_Entity (Spec))
8724 Bname : constant Unit_Name_Type :=
8725 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8728 Error_Msg_Unit_1 := Bname;
8729 Error_Msg_N ("this instantiation requires$!", N);
8731 Get_File_Name (Bname, Subunit => False);
8732 Error_Msg_N ("\but file{ was not found!", N);
8733 raise Unrecoverable_Error;
8739 -- If loading the parent of the generic caused an instantiation
8740 -- circularity, we abandon compilation at this point, because
8741 -- otherwise in some cases we get into trouble with infinite
8742 -- recursions after this point.
8744 if Circularity_Detected then
8745 raise Unrecoverable_Error;
8747 end Load_Parent_Of_Generic;
8749 -----------------------
8750 -- Move_Freeze_Nodes --
8751 -----------------------
8753 procedure Move_Freeze_Nodes
8754 (Out_Of : Entity_Id;
8759 Next_Decl : Node_Id;
8760 Next_Node : Node_Id := After;
8763 function Is_Outer_Type (T : Entity_Id) return Boolean;
8764 -- Check whether entity is declared in a scope external to that
8765 -- of the generic unit.
8771 function Is_Outer_Type (T : Entity_Id) return Boolean is
8772 Scop : Entity_Id := Scope (T);
8775 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8779 while Scop /= Standard_Standard loop
8781 if Scop = Out_Of then
8784 Scop := Scope (Scop);
8792 -- Start of processing for Move_Freeze_Nodes
8799 -- First remove the freeze nodes that may appear before all other
8803 while Present (Decl)
8804 and then Nkind (Decl) = N_Freeze_Entity
8805 and then Is_Outer_Type (Entity (Decl))
8807 Decl := Remove_Head (L);
8808 Insert_After (Next_Node, Decl);
8809 Set_Analyzed (Decl, False);
8814 -- Next scan the list of declarations and remove each freeze node that
8815 -- appears ahead of the current node.
8817 while Present (Decl) loop
8818 while Present (Next (Decl))
8819 and then Nkind (Next (Decl)) = N_Freeze_Entity
8820 and then Is_Outer_Type (Entity (Next (Decl)))
8822 Next_Decl := Remove_Next (Decl);
8823 Insert_After (Next_Node, Next_Decl);
8824 Set_Analyzed (Next_Decl, False);
8825 Next_Node := Next_Decl;
8828 -- If the declaration is a nested package or concurrent type, then
8829 -- recurse. Nested generic packages will have been processed from the
8832 if Nkind (Decl) = N_Package_Declaration then
8833 Spec := Specification (Decl);
8835 elsif Nkind (Decl) = N_Task_Type_Declaration then
8836 Spec := Task_Definition (Decl);
8838 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8839 Spec := Protected_Definition (Decl);
8845 if Present (Spec) then
8846 Move_Freeze_Nodes (Out_Of, Next_Node,
8847 Visible_Declarations (Spec));
8848 Move_Freeze_Nodes (Out_Of, Next_Node,
8849 Private_Declarations (Spec));
8854 end Move_Freeze_Nodes;
8860 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8862 return Generic_Renamings.Table (E).Next_In_HTable;
8865 ------------------------
8866 -- Preanalyze_Actuals --
8867 ------------------------
8869 procedure Pre_Analyze_Actuals (N : Node_Id) is
8872 Errs : constant Int := Serious_Errors_Detected;
8875 Assoc := First (Generic_Associations (N));
8877 while Present (Assoc) loop
8878 Act := Explicit_Generic_Actual_Parameter (Assoc);
8880 -- Within a nested instantiation, a defaulted actual is an
8881 -- empty association, so nothing to analyze. If the actual for
8882 -- a subprogram is an attribute, analyze prefix only, because
8883 -- actual is not a complete attribute reference.
8885 -- If actual is an allocator, analyze expression only. The full
8886 -- analysis can generate code, and if the instance is a compilation
8887 -- unit we have to wait until the package instance is installed to
8888 -- have a proper place to insert this code.
8890 -- String literals may be operators, but at this point we do not
8891 -- know whether the actual is a formal subprogram or a string.
8896 elsif Nkind (Act) = N_Attribute_Reference then
8897 Analyze (Prefix (Act));
8899 elsif Nkind (Act) = N_Explicit_Dereference then
8900 Analyze (Prefix (Act));
8902 elsif Nkind (Act) = N_Allocator then
8904 Expr : constant Node_Id := Expression (Act);
8907 if Nkind (Expr) = N_Subtype_Indication then
8908 Analyze (Subtype_Mark (Expr));
8909 Analyze_List (Constraints (Constraint (Expr)));
8915 elsif Nkind (Act) /= N_Operator_Symbol then
8919 if Errs /= Serious_Errors_Detected then
8920 Abandon_Instantiation (Act);
8925 end Pre_Analyze_Actuals;
8931 procedure Remove_Parent (In_Body : Boolean := False) is
8932 S : Entity_Id := Current_Scope;
8938 -- After child instantiation is complete, remove from scope stack
8939 -- the extra copy of the current scope, and then remove parent
8945 while Current_Scope /= S loop
8947 End_Package_Scope (Current_Scope);
8949 if In_Open_Scopes (P) then
8950 E := First_Entity (P);
8952 while Present (E) loop
8953 Set_Is_Immediately_Visible (E, True);
8957 if Is_Generic_Instance (Current_Scope)
8958 and then P /= Current_Scope
8960 -- We are within an instance of some sibling. Retain
8961 -- visibility of parent, for proper subsequent cleanup,
8962 -- and reinstall private declarations as well.
8964 Set_In_Private_Part (P);
8965 Install_Private_Declarations (P);
8968 -- This looks incomplete: what about compilation units that
8969 -- were made visible by Install_Parent but should not remain
8970 -- visible??? Standard is on the scope stack.
8972 elsif not In_Open_Scopes (Scope (P)) then
8973 Set_Is_Immediately_Visible (P, False);
8977 -- Reset visibility of entities in the enclosing scope.
8979 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8980 Hidden := First_Elmt (Hidden_Entities);
8982 while Present (Hidden) loop
8983 Set_Is_Immediately_Visible (Node (Hidden), True);
8988 -- Each body is analyzed separately, and there is no context
8989 -- that needs preserving from one body instance to the next,
8990 -- so remove all parent scopes that have been installed.
8992 while Present (S) loop
8993 End_Package_Scope (S);
8994 Set_Is_Immediately_Visible (S, False);
8996 exit when S = Standard_Standard;
9006 procedure Restore_Env is
9007 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
9010 Ada_Version := Saved.Ada_Version;
9012 if No (Current_Instantiated_Parent.Act_Id) then
9014 -- Restore environment after subprogram inlining
9016 Restore_Private_Views (Empty);
9019 Current_Instantiated_Parent := Saved.Instantiated_Parent;
9020 Exchanged_Views := Saved.Exchanged_Views;
9021 Hidden_Entities := Saved.Hidden_Entities;
9022 Current_Sem_Unit := Saved.Current_Sem_Unit;
9024 Instance_Envs.Decrement_Last;
9027 ---------------------------
9028 -- Restore_Private_Views --
9029 ---------------------------
9031 procedure Restore_Private_Views
9032 (Pack_Id : Entity_Id;
9033 Is_Package : Boolean := True)
9041 procedure Restore_Nested_Formal (Formal : Entity_Id);
9042 -- Hide the generic formals of formal packages declared with box
9043 -- which were reachable in the current instantiation.
9045 procedure Restore_Nested_Formal (Formal : Entity_Id) is
9048 if Present (Renamed_Object (Formal))
9049 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
9053 elsif Present (Associated_Formal_Package (Formal))
9054 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9056 Ent := First_Entity (Formal);
9058 while Present (Ent) loop
9059 exit when Ekind (Ent) = E_Package
9060 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9062 Set_Is_Hidden (Ent);
9063 Set_Is_Potentially_Use_Visible (Ent, False);
9065 if Ekind (Ent) = E_Package then
9067 Restore_Nested_Formal (Ent);
9073 end Restore_Nested_Formal;
9076 M := First_Elmt (Exchanged_Views);
9077 while Present (M) loop
9080 -- Subtypes of types whose views have been exchanged, and that
9081 -- are defined within the instance, were not on the list of
9082 -- Private_Dependents on entry to the instance, so they have to
9083 -- be exchanged explicitly now, in order to remain consistent with
9084 -- the view of the parent type.
9086 if Ekind (Typ) = E_Private_Type
9087 or else Ekind (Typ) = E_Limited_Private_Type
9088 or else Ekind (Typ) = E_Record_Type_With_Private
9090 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9092 while Present (Dep_Elmt) loop
9093 Dep_Typ := Node (Dep_Elmt);
9095 if Scope (Dep_Typ) = Pack_Id
9096 and then Present (Full_View (Dep_Typ))
9098 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9099 Exchange_Declarations (Dep_Typ);
9102 Next_Elmt (Dep_Elmt);
9106 Exchange_Declarations (Node (M));
9110 if No (Pack_Id) then
9114 -- Make the generic formal parameters private, and make the formal
9115 -- types into subtypes of the actuals again.
9117 E := First_Entity (Pack_Id);
9119 while Present (E) loop
9120 Set_Is_Hidden (E, True);
9123 and then Nkind (Parent (E)) = N_Subtype_Declaration
9125 Set_Is_Generic_Actual_Type (E, False);
9127 -- An unusual case of aliasing: the actual may also be directly
9128 -- visible in the generic, and be private there, while it is
9129 -- fully visible in the context of the instance. The internal
9130 -- subtype is private in the instance, but has full visibility
9131 -- like its parent in the enclosing scope. This enforces the
9132 -- invariant that the privacy status of all private dependents of
9133 -- a type coincide with that of the parent type. This can only
9134 -- happen when a generic child unit is instantiated within a
9137 if Is_Private_Type (E)
9138 and then not Is_Private_Type (Etype (E))
9140 Exchange_Declarations (E);
9143 elsif Ekind (E) = E_Package then
9145 -- The end of the renaming list is the renaming of the generic
9146 -- package itself. If the instance is a subprogram, all entities
9147 -- in the corresponding package are renamings. If this entity is
9148 -- a formal package, make its own formals private as well. The
9149 -- actual in this case is itself the renaming of an instantation.
9150 -- If the entity is not a package renaming, it is the entity
9151 -- created to validate formal package actuals: ignore.
9153 -- If the actual is itself a formal package for the enclosing
9154 -- generic, or the actual for such a formal package, it remains
9155 -- visible on exit from the instance, and therefore nothing
9156 -- needs to be done either, except to keep it accessible.
9159 and then Renamed_Object (E) = Pack_Id
9163 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9166 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9167 Set_Is_Hidden (E, False);
9171 Act_P : constant Entity_Id := Renamed_Object (E);
9175 Id := First_Entity (Act_P);
9177 and then Id /= First_Private_Entity (Act_P)
9179 exit when Ekind (Id) = E_Package
9180 and then Renamed_Object (Id) = Act_P;
9182 Set_Is_Hidden (Id, True);
9183 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9185 if Ekind (Id) = E_Package then
9186 Restore_Nested_Formal (Id);
9197 end Restore_Private_Views;
9204 (Gen_Unit : Entity_Id;
9205 Act_Unit : Entity_Id)
9209 Set_Instance_Env (Gen_Unit, Act_Unit);
9212 ----------------------------
9213 -- Save_Global_References --
9214 ----------------------------
9216 procedure Save_Global_References (N : Node_Id) is
9217 Gen_Scope : Entity_Id;
9221 function Is_Global (E : Entity_Id) return Boolean;
9222 -- Check whether entity is defined outside of generic unit.
9223 -- Examine the scope of an entity, and the scope of the scope,
9224 -- etc, until we find either Standard, in which case the entity
9225 -- is global, or the generic unit itself, which indicates that
9226 -- the entity is local. If the entity is the generic unit itself,
9227 -- as in the case of a recursive call, or the enclosing generic unit,
9228 -- if different from the current scope, then it is local as well,
9229 -- because it will be replaced at the point of instantiation. On
9230 -- the other hand, if it is a reference to a child unit of a common
9231 -- ancestor, which appears in an instantiation, it is global because
9232 -- it is used to denote a specific compilation unit at the time the
9233 -- instantiations will be analyzed.
9235 procedure Reset_Entity (N : Node_Id);
9236 -- Save semantic information on global entity, so that it is not
9237 -- resolved again at instantiation time.
9239 procedure Save_Entity_Descendants (N : Node_Id);
9240 -- Apply Save_Global_References to the two syntactic descendants of
9241 -- non-terminal nodes that carry an Associated_Node and are processed
9242 -- through Reset_Entity. Once the global entity (if any) has been
9243 -- captured together with its type, only two syntactic descendants
9244 -- need to be traversed to complete the processing of the tree rooted
9245 -- at N. This applies to Selected_Components, Expanded_Names, and to
9246 -- Operator nodes. N can also be a character literal, identifier, or
9247 -- operator symbol node, but the call has no effect in these cases.
9249 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9250 -- Default actuals in nested instances must be handled specially
9251 -- because there is no link to them from the original tree. When an
9252 -- actual subprogram is given by a default, we add an explicit generic
9253 -- association for it in the instantiation node. When we save the
9254 -- global references on the name of the instance, we recover the list
9255 -- of generic associations, and add an explicit one to the original
9256 -- generic tree, through which a global actual can be preserved.
9257 -- Similarly, if a child unit is instantiated within a sibling, in the
9258 -- context of the parent, we must preserve the identifier of the parent
9259 -- so that it can be properly resolved in a subsequent instantiation.
9261 procedure Save_Global_Descendant (D : Union_Id);
9262 -- Apply Save_Global_References recursively to the descendents of
9265 procedure Save_References (N : Node_Id);
9266 -- This is the recursive procedure that does the work, once the
9267 -- enclosing generic scope has been established.
9273 function Is_Global (E : Entity_Id) return Boolean is
9274 Se : Entity_Id := Scope (E);
9276 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9277 -- Determine whether the parent node of a reference to a child unit
9278 -- denotes an instantiation or a formal package, in which case the
9279 -- reference to the child unit is global, even if it appears within
9280 -- the current scope (e.g. when the instance appears within the body
9283 ----------------------
9284 -- Is_Instance_Node --
9285 ----------------------
9287 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9289 return (Nkind (Decl) in N_Generic_Instantiation
9291 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9292 end Is_Instance_Node;
9294 -- Start of processing for Is_Global
9297 if E = Gen_Scope then
9300 elsif E = Standard_Standard then
9303 elsif Is_Child_Unit (E)
9304 and then (Is_Instance_Node (Parent (N2))
9305 or else (Nkind (Parent (N2)) = N_Expanded_Name
9306 and then N2 = Selector_Name (Parent (N2))
9307 and then Is_Instance_Node (Parent (Parent (N2)))))
9312 while Se /= Gen_Scope loop
9313 if Se = Standard_Standard then
9328 procedure Reset_Entity (N : Node_Id) is
9330 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9331 -- The type of N2 is global to the generic unit. Save the
9332 -- type in the generic node.
9334 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9335 -- Find the ultimate ancestor of the current unit. If it is
9336 -- not a generic unit, then the name of the current unit
9337 -- in the prefix of an expanded name must be replaced with
9338 -- its generic homonym to ensure that it will be properly
9339 -- resolved in an instance.
9341 ---------------------
9342 -- Set_Global_Type --
9343 ---------------------
9345 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9346 Typ : constant Entity_Id := Etype (N2);
9352 and then Has_Private_View (Entity (N))
9354 -- If the entity of N is not the associated node, this is
9355 -- a nested generic and it has an associated node as well,
9356 -- whose type is already the full view (see below). Indicate
9357 -- that the original node has a private view.
9359 Set_Has_Private_View (N);
9362 -- If not a private type, nothing else to do
9364 if not Is_Private_Type (Typ) then
9365 if Is_Array_Type (Typ)
9366 and then Is_Private_Type (Component_Type (Typ))
9368 Set_Has_Private_View (N);
9371 -- If it is a derivation of a private type in a context where
9372 -- no full view is needed, nothing to do either.
9374 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9377 -- Otherwise mark the type for flipping and use the full_view
9381 Set_Has_Private_View (N);
9383 if Present (Full_View (Typ)) then
9384 Set_Etype (N2, Full_View (Typ));
9387 end Set_Global_Type;
9393 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9394 Par : Entity_Id := E;
9397 while Is_Child_Unit (Par) loop
9404 -- Start of processing for Reset_Entity
9407 N2 := Get_Associated_Node (N);
9411 if Is_Global (E) then
9412 Set_Global_Type (N, N2);
9414 elsif Nkind (N) = N_Op_Concat
9415 and then Is_Generic_Type (Etype (N2))
9417 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9418 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9419 and then Is_Intrinsic_Subprogram (E)
9424 -- Entity is local. Mark generic node as unresolved.
9425 -- Note that now it does not have an entity.
9427 Set_Associated_Node (N, Empty);
9428 Set_Etype (N, Empty);
9431 if (Nkind (Parent (N)) = N_Package_Instantiation
9432 or else Nkind (Parent (N)) = N_Function_Instantiation
9433 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9434 and then N = Name (Parent (N))
9436 Save_Global_Defaults (Parent (N), Parent (N2));
9439 elsif Nkind (Parent (N)) = N_Selected_Component
9440 and then Nkind (Parent (N2)) = N_Expanded_Name
9443 if Is_Global (Entity (Parent (N2))) then
9444 Change_Selected_Component_To_Expanded_Name (Parent (N));
9445 Set_Associated_Node (Parent (N), Parent (N2));
9446 Set_Global_Type (Parent (N), Parent (N2));
9447 Save_Entity_Descendants (N);
9449 -- If this is a reference to the current generic entity,
9450 -- replace by the name of the generic homonym of the current
9451 -- package. This is because in an instantiation Par.P.Q will
9452 -- not resolve to the name of the instance, whose enclosing
9453 -- scope is not necessarily Par. We use the generic homonym
9454 -- rather that the name of the generic itself, because it may
9455 -- be hidden by a local declaration.
9457 elsif In_Open_Scopes (Entity (Parent (N2)))
9459 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9461 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9462 Rewrite (Parent (N),
9463 Make_Identifier (Sloc (N),
9465 Chars (Generic_Homonym (Entity (Parent (N2))))));
9467 Rewrite (Parent (N),
9468 Make_Identifier (Sloc (N),
9469 Chars => Chars (Selector_Name (Parent (N2)))));
9473 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9474 or else Nkind (Parent (Parent (N)))
9475 = N_Function_Instantiation
9476 or else Nkind (Parent (Parent (N)))
9477 = N_Procedure_Instantiation)
9478 and then Parent (N) = Name (Parent (Parent (N)))
9480 Save_Global_Defaults
9481 (Parent (Parent (N)), Parent (Parent ((N2))));
9484 -- A selected component may denote a static constant that has
9485 -- been folded. Make the same replacement in original tree.
9487 elsif Nkind (Parent (N)) = N_Selected_Component
9488 and then (Nkind (Parent (N2)) = N_Integer_Literal
9489 or else Nkind (Parent (N2)) = N_Real_Literal)
9491 Rewrite (Parent (N),
9492 New_Copy (Parent (N2)));
9493 Set_Analyzed (Parent (N), False);
9495 -- A selected component may be transformed into a parameterless
9496 -- function call. If the called entity is global, rewrite the
9497 -- node appropriately, i.e. as an extended name for the global
9500 elsif Nkind (Parent (N)) = N_Selected_Component
9501 and then Nkind (Parent (N2)) = N_Function_Call
9502 and then Is_Global (Entity (Name (Parent (N2))))
9504 Change_Selected_Component_To_Expanded_Name (Parent (N));
9505 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9506 Set_Global_Type (Parent (N), Name (Parent (N2)));
9507 Save_Entity_Descendants (N);
9510 -- Entity is local. Reset in generic unit, so that node
9511 -- is resolved anew at the point of instantiation.
9513 Set_Associated_Node (N, Empty);
9514 Set_Etype (N, Empty);
9518 -----------------------------
9519 -- Save_Entity_Descendants --
9520 -----------------------------
9522 procedure Save_Entity_Descendants (N : Node_Id) is
9526 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9527 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9530 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9532 when N_Expanded_Name | N_Selected_Component =>
9533 Save_Global_Descendant (Union_Id (Prefix (N)));
9534 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9536 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9540 raise Program_Error;
9542 end Save_Entity_Descendants;
9544 --------------------------
9545 -- Save_Global_Defaults --
9546 --------------------------
9548 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9549 Loc : constant Source_Ptr := Sloc (N1);
9550 Assoc2 : constant List_Id := Generic_Associations (N2);
9551 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9561 Assoc1 := Generic_Associations (N1);
9563 if Present (Assoc1) then
9564 Act1 := First (Assoc1);
9567 Set_Generic_Associations (N1, New_List);
9568 Assoc1 := Generic_Associations (N1);
9571 if Present (Assoc2) then
9572 Act2 := First (Assoc2);
9577 while Present (Act1) and then Present (Act2) loop
9582 -- Find the associations added for default suprograms.
9584 if Present (Act2) then
9585 while Nkind (Act2) /= N_Generic_Association
9586 or else No (Entity (Selector_Name (Act2)))
9587 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9592 -- Add a similar association if the default is global. The
9593 -- renaming declaration for the actual has been analyzed, and
9594 -- its alias is the program it renames. Link the actual in the
9595 -- original generic tree with the node in the analyzed tree.
9597 while Present (Act2) loop
9598 Subp := Entity (Selector_Name (Act2));
9599 Def := Explicit_Generic_Actual_Parameter (Act2);
9601 -- Following test is defence against rubbish errors
9603 if No (Alias (Subp)) then
9607 -- Retrieve the resolved actual from the renaming declaration
9608 -- created for the instantiated formal.
9610 Actual := Entity (Name (Parent (Parent (Subp))));
9611 Set_Entity (Def, Actual);
9612 Set_Etype (Def, Etype (Actual));
9614 if Is_Global (Actual) then
9616 Make_Generic_Association (Loc,
9617 Selector_Name => New_Occurrence_Of (Subp, Loc),
9618 Explicit_Generic_Actual_Parameter =>
9619 New_Occurrence_Of (Actual, Loc));
9622 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9624 Append (Ndec, Assoc1);
9626 -- If there are other defaults, add a dummy association
9627 -- in case there are other defaulted formals with the same
9630 elsif Present (Next (Act2)) then
9632 Make_Generic_Association (Loc,
9633 Selector_Name => New_Occurrence_Of (Subp, Loc),
9634 Explicit_Generic_Actual_Parameter => Empty);
9636 Append (Ndec, Assoc1);
9643 if Nkind (Name (N1)) = N_Identifier
9644 and then Is_Child_Unit (Gen_Id)
9645 and then Is_Global (Gen_Id)
9646 and then Is_Generic_Unit (Scope (Gen_Id))
9647 and then In_Open_Scopes (Scope (Gen_Id))
9649 -- This is an instantiation of a child unit within a sibling,
9650 -- so that the generic parent is in scope. An eventual instance
9651 -- must occur within the scope of an instance of the parent.
9652 -- Make name in instance into an expanded name, to preserve the
9653 -- identifier of the parent, so it can be resolved subsequently.
9656 Make_Expanded_Name (Loc,
9657 Chars => Chars (Gen_Id),
9658 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9659 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9660 Set_Entity (Name (N2), Gen_Id);
9663 Make_Expanded_Name (Loc,
9664 Chars => Chars (Gen_Id),
9665 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9666 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9668 Set_Associated_Node (Name (N1), Name (N2));
9669 Set_Associated_Node (Prefix (Name (N1)), Empty);
9671 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9672 Set_Etype (Name (N1), Etype (Gen_Id));
9675 end Save_Global_Defaults;
9677 ----------------------------
9678 -- Save_Global_Descendant --
9679 ----------------------------
9681 procedure Save_Global_Descendant (D : Union_Id) is
9685 if D in Node_Range then
9686 if D = Union_Id (Empty) then
9689 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9690 Save_References (Node_Id (D));
9693 elsif D in List_Range then
9694 if D = Union_Id (No_List)
9695 or else Is_Empty_List (List_Id (D))
9700 N1 := First (List_Id (D));
9701 while Present (N1) loop
9702 Save_References (N1);
9707 -- Element list or other non-node field, nothing to do
9712 end Save_Global_Descendant;
9714 ---------------------
9715 -- Save_References --
9716 ---------------------
9718 -- This is the recursive procedure that does the work, once the
9719 -- enclosing generic scope has been established. We have to treat
9720 -- specially a number of node rewritings that are required by semantic
9721 -- processing and which change the kind of nodes in the generic copy:
9722 -- typically constant-folding, replacing an operator node by a string
9723 -- literal, or a selected component by an expanded name. In each of
9724 -- those cases, the transformation is propagated to the generic unit.
9726 procedure Save_References (N : Node_Id) is
9731 elsif Nkind (N) = N_Character_Literal
9732 or else Nkind (N) = N_Operator_Symbol
9734 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9737 elsif Nkind (N) = N_Operator_Symbol
9738 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9740 Change_Operator_Symbol_To_String_Literal (N);
9743 elsif Nkind (N) in N_Op then
9745 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9747 if Nkind (N) = N_Op_Concat then
9748 Set_Is_Component_Left_Opnd (N,
9749 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9751 Set_Is_Component_Right_Opnd (N,
9752 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9757 -- Node may be transformed into call to a user-defined operator
9759 N2 := Get_Associated_Node (N);
9761 if Nkind (N2) = N_Function_Call then
9762 E := Entity (Name (N2));
9765 and then Is_Global (E)
9767 Set_Etype (N, Etype (N2));
9769 Set_Associated_Node (N, Empty);
9770 Set_Etype (N, Empty);
9773 elsif Nkind (N2) = N_Integer_Literal
9774 or else Nkind (N2) = N_Real_Literal
9775 or else Nkind (N2) = N_String_Literal
9777 -- Operation was constant-folded, perform the same
9778 -- replacement in generic.
9780 Rewrite (N, New_Copy (N2));
9781 Set_Analyzed (N, False);
9783 elsif Nkind (N2) = N_Identifier
9784 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9786 -- Same if call was folded into a literal, but in this
9787 -- case retain the entity to avoid spurious ambiguities
9788 -- if id is overloaded at the point of instantiation or
9791 Rewrite (N, New_Copy (N2));
9792 Set_Analyzed (N, False);
9796 -- Complete the check on operands, if node has not been
9799 if Nkind (N) in N_Op then
9800 Save_Entity_Descendants (N);
9803 elsif Nkind (N) = N_Identifier then
9804 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9806 -- If this is a discriminant reference, always save it.
9807 -- It is used in the instance to find the corresponding
9808 -- discriminant positionally rather than by name.
9810 Set_Original_Discriminant
9811 (N, Original_Discriminant (Get_Associated_Node (N)));
9815 N2 := Get_Associated_Node (N);
9817 if Nkind (N2) = N_Function_Call then
9818 E := Entity (Name (N2));
9820 -- Name resolves to a call to parameterless function.
9821 -- If original entity is global, mark node as resolved.
9824 and then Is_Global (E)
9826 Set_Etype (N, Etype (N2));
9828 Set_Associated_Node (N, Empty);
9829 Set_Etype (N, Empty);
9833 Nkind (N2) = N_Integer_Literal or else
9834 Nkind (N2) = N_Real_Literal or else
9835 Nkind (N2) = N_String_Literal
9837 -- Name resolves to named number that is constant-folded,
9838 -- or to string literal from concatenation.
9839 -- Perform the same replacement in generic.
9841 Rewrite (N, New_Copy (N2));
9842 Set_Analyzed (N, False);
9844 elsif Nkind (N2) = N_Explicit_Dereference then
9846 -- An identifier is rewritten as a dereference if it is
9847 -- the prefix in a selected component, and it denotes an
9848 -- access to a composite type, or a parameterless function
9849 -- call that returns an access type.
9851 -- Check whether corresponding entity in prefix is global.
9853 if Is_Entity_Name (Prefix (N2))
9854 and then Present (Entity (Prefix (N2)))
9855 and then Is_Global (Entity (Prefix (N2)))
9858 Make_Explicit_Dereference (Sloc (N),
9859 Prefix => Make_Identifier (Sloc (N),
9860 Chars => Chars (N))));
9861 Set_Associated_Node (Prefix (N), Prefix (N2));
9863 elsif Nkind (Prefix (N2)) = N_Function_Call
9864 and then Is_Global (Entity (Name (Prefix (N2))))
9867 Make_Explicit_Dereference (Sloc (N),
9868 Prefix => Make_Function_Call (Sloc (N),
9870 Make_Identifier (Sloc (N),
9871 Chars => Chars (N)))));
9874 (Name (Prefix (N)), Name (Prefix (N2)));
9877 Set_Associated_Node (N, Empty);
9878 Set_Etype (N, Empty);
9881 -- The subtype mark of a nominally unconstrained object
9882 -- is rewritten as a subtype indication using the bounds
9883 -- of the expression. Recover the original subtype mark.
9885 elsif Nkind (N2) = N_Subtype_Indication
9886 and then Is_Entity_Name (Original_Node (N2))
9888 Set_Associated_Node (N, Original_Node (N2));
9896 elsif Nkind (N) in N_Entity then
9901 use Atree.Unchecked_Access;
9902 -- This code section is part of implementing an untyped tree
9903 -- traversal, so it needs direct access to node fields.
9906 if Nkind (N) = N_Aggregate
9908 Nkind (N) = N_Extension_Aggregate
9910 N2 := Get_Associated_Node (N);
9913 or else No (Etype (N2))
9914 or else not Is_Global (Etype (N2))
9916 Set_Associated_Node (N, Empty);
9919 Save_Global_Descendant (Field1 (N));
9920 Save_Global_Descendant (Field2 (N));
9921 Save_Global_Descendant (Field3 (N));
9922 Save_Global_Descendant (Field5 (N));
9924 -- All other cases than aggregates
9927 Save_Global_Descendant (Field1 (N));
9928 Save_Global_Descendant (Field2 (N));
9929 Save_Global_Descendant (Field3 (N));
9930 Save_Global_Descendant (Field4 (N));
9931 Save_Global_Descendant (Field5 (N));
9935 end Save_References;
9937 -- Start of processing for Save_Global_References
9940 Gen_Scope := Current_Scope;
9942 -- If the generic unit is a child unit, references to entities in
9943 -- the parent are treated as local, because they will be resolved
9944 -- anew in the context of the instance of the parent.
9946 while Is_Child_Unit (Gen_Scope)
9947 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9949 Gen_Scope := Scope (Gen_Scope);
9952 Save_References (N);
9953 end Save_Global_References;
9955 --------------------------------------
9956 -- Set_Copied_Sloc_For_Inlined_Body --
9957 --------------------------------------
9959 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9961 Create_Instantiation_Source (N, E, True, S_Adjustment);
9962 end Set_Copied_Sloc_For_Inlined_Body;
9964 ---------------------
9965 -- Set_Instance_Of --
9966 ---------------------
9968 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9970 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9971 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9972 Generic_Renamings.Increment_Last;
9973 end Set_Instance_Of;
9975 --------------------
9976 -- Set_Next_Assoc --
9977 --------------------
9979 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9981 Generic_Renamings.Table (E).Next_In_HTable := Next;
9988 procedure Start_Generic is
9990 -- ??? I am sure more things could be factored out in this
9991 -- routine. Should probably be done at a later stage.
9993 Generic_Flags.Increment_Last;
9994 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9995 Inside_A_Generic := True;
9997 Expander_Mode_Save_And_Set (False);
10000 ----------------------
10001 -- Set_Instance_Env --
10002 ----------------------
10004 procedure Set_Instance_Env
10005 (Gen_Unit : Entity_Id;
10006 Act_Unit : Entity_Id)
10010 -- Regardless of the current mode, predefined units are analyzed in
10011 -- the most current Ada mode, and earlier version Ada checks do not
10012 -- apply to predefined units.
10014 if Is_Internal_File_Name
10015 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
10016 Renamings_Included => True) then
10017 Ada_Version := Ada_Version_Type'Last;
10020 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
10021 end Set_Instance_Env;
10027 procedure Switch_View (T : Entity_Id) is
10028 BT : constant Entity_Id := Base_Type (T);
10029 Priv_Elmt : Elmt_Id := No_Elmt;
10030 Priv_Sub : Entity_Id;
10033 -- T may be private but its base type may have been exchanged through
10034 -- some other occurrence, in which case there is nothing to switch.
10036 if not Is_Private_Type (BT) then
10040 Priv_Elmt := First_Elmt (Private_Dependents (BT));
10042 if Present (Full_View (BT)) then
10043 Append_Elmt (Full_View (BT), Exchanged_Views);
10044 Exchange_Declarations (BT);
10047 while Present (Priv_Elmt) loop
10048 Priv_Sub := (Node (Priv_Elmt));
10050 -- We avoid flipping the subtype if the Etype of its full
10051 -- view is private because this would result in a malformed
10052 -- subtype. This occurs when the Etype of the subtype full
10053 -- view is the full view of the base type (and since the
10054 -- base types were just switched, the subtype is pointing
10055 -- to the wrong view). This is currently the case for
10056 -- tagged record types, access types (maybe more?) and
10057 -- needs to be resolved. ???
10059 if Present (Full_View (Priv_Sub))
10060 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10062 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10063 Exchange_Declarations (Priv_Sub);
10066 Next_Elmt (Priv_Elmt);
10070 -----------------------------
10071 -- Valid_Default_Attribute --
10072 -----------------------------
10074 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10075 Attr_Id : constant Attribute_Id :=
10076 Get_Attribute_Id (Attribute_Name (Def));
10077 T : constant Entity_Id := Entity (Prefix (Def));
10078 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10091 F := First_Formal (Nam);
10092 while Present (F) loop
10093 Num_F := Num_F + 1;
10098 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10099 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10100 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10101 Attribute_Unbiased_Rounding =>
10104 and then Is_Floating_Point_Type (T);
10106 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10107 Attribute_Value | Attribute_Wide_Image |
10108 Attribute_Wide_Value =>
10109 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10111 when Attribute_Max | Attribute_Min =>
10112 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10114 when Attribute_Input =>
10115 OK := (Is_Fun and then Num_F = 1);
10117 when Attribute_Output | Attribute_Read | Attribute_Write =>
10118 OK := (not Is_Fun and then Num_F = 2);
10125 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10128 end Valid_Default_Attribute;